20643205

素因数分解:

$5^1\times {\mathrm{11}}^2\times {\mathrm{149}}^1\times {\mathrm{229}}^1$

素因数の和:405

約数の個数: 24

約数和(自身を含む): 27531000

約数和(自身を除く): 6887795

約数列:

[1, 5, 11, 55, 121, 149, 229, 605, 745, 1145, 1639, 2519, 8195, 12595, 18029, 27709, 34121, 90145, 138545, 170605, 375331, 1876655, 4128641, 20643205]

約数ペア:

[(1, 20643205), (5, 4128641), (11, 1876655), (55, 375331), (121, 170605), (149, 138545), (229, 90145), (605, 34121), (745, 27709), (1145, 18029), (1639, 12595), (2519, 8195)]