23) 144 = 24 * 32
sum of divisor of 144 = (20+21+22+23 +24) * (30+31+32)
=(25-1)/(2-1) * (33-1)/(3-1) = 31*13 = 403
160 = 25 * 51
sum of divisor of 160 = (20+21+22+23 +24 +25) * (50+51)
=(26-1)/(2-1) * (52-1)/(5-1) = 63*6 = 378
now SUM of SUM OF DIVISOR = 403 + 378 =781
24)
96 = 25 * 31
sum of EVEN divisor of 96 = (21 + 22 + 23 + 24 +25) * (30 +31)
(we are not adding 20 term becoz when we multiply with any odd term we get odd term only )
=2(25-1)/(2-1) * (32-1)/(3-1) = 62 * 4 = 248
3600 = 24 * 32 * 52
sum of ODD divisor of 96 = (30 +31 +32) * (50+51+52)
(here for odd divisor we consider only odd term as we know even * odd =even)
= (33-1)/(3-1) * (53-1)/(5-1) =13 * 31 = 403
now SUM is 248 + 403 = 651