21085865

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{359}}^1\times {\mathrm{691}}^1$

素因数の和:1072

約数の個数: 16

約数和(自身を含む): 26904960

約数和(自身を除く): 5819095

約数列:

[1, 5, 17, 85, 359, 691, 1795, 3455, 6103, 11747, 30515, 58735, 248069, 1240345, 4217173, 21085865]

約数ペア:

[(1, 21085865), (5, 4217173), (17, 1240345), (85, 248069), (359, 58735), (691, 30515), (1795, 11747), (3455, 6103)]