20997890

素因数分解:

$2^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{123517}}^1$

素因数の和:123541

約数の個数: 16

約数和(自身を含む): 40019832

約数和(自身を除く): 19021942

約数列:

[1, 2, 5, 10, 17, 34, 85, 170, 123517, 247034, 617585, 1235170, 2099789, 4199578, 10498945, 20997890]

約数ペア:

[(1, 20997890), (2, 10498945), (5, 4199578), (10, 2099789), (17, 1235170), (34, 617585), (85, 247034), (170, 123517)]