20686640

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19891}}^1$

素因数の和:19917

約数の個数: 40

約数和(自身を含む): 51798768

約数和(自身を除く): 31112128

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 19891, 39782, 79564, 99455, 159128, 198910, 258583, 318256, 397820, 517166, 795640, 1034332, 1292915, 1591280, 2068664, 2585830, 4137328, 5171660, 10343320, 20686640]

約数ペア:

[(1, 20686640), (2, 10343320), (4, 5171660), (5, 4137328), (8, 2585830), (10, 2068664), (13, 1591280), (16, 1292915), (20, 1034332), (26, 795640), (40, 517166), (52, 397820), (65, 318256), (80, 258583), (104, 198910), (130, 159128), (208, 99455), (260, 79564), (520, 39782), (1040, 19891)]