20999080

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{30881}}^1$

素因数の和:30909

約数の個数: 32

約数和(自身を含む): 50028840

約数和(自身を除く): 29029760

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 340, 680, 30881, 61762, 123524, 154405, 247048, 308810, 524977, 617620, 1049954, 1235240, 2099908, 2624885, 4199816, 5249770, 10499540, 20999080]

約数ペア:

[(1, 20999080), (2, 10499540), (4, 5249770), (5, 4199816), (8, 2624885), (10, 2099908), (17, 1235240), (20, 1049954), (34, 617620), (40, 524977), (68, 308810), (85, 247048), (136, 154405), (170, 123524), (340, 61762), (680, 30881)]