20984990

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{337}}^1\times {\mathrm{479}}^1$

素因数の和:836

約数の個数: 32

約数和(自身を含む): 40884480

約数和(自身を除く): 19899490

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 337, 479, 674, 958, 1685, 2395, 3370, 4381, 4790, 6227, 8762, 12454, 21905, 31135, 43810, 62270, 161423, 322846, 807115, 1614230, 2098499, 4196998, 10492495, 20984990]

約数ペア:

[(1, 20984990), (2, 10492495), (5, 4196998), (10, 2098499), (13, 1614230), (26, 807115), (65, 322846), (130, 161423), (337, 62270), (479, 43810), (674, 31135), (958, 21905), (1685, 12454), (2395, 8762), (3370, 6227), (4381, 4790)]