21710090

素因数分解:

$2^1\times 5^1\times {\mathrm{389}}^1\times {\mathrm{5581}}^1$

素因数の和:5977

約数の個数: 16

約数和(自身を含む): 39185640

約数和(自身を除く): 17475550

約数列:

[1, 2, 5, 10, 389, 778, 1945, 3890, 5581, 11162, 27905, 55810, 2171009, 4342018, 10855045, 21710090]

約数ペア:

[(1, 21710090), (2, 10855045), (5, 4342018), (10, 2171009), (389, 55810), (778, 27905), (1945, 11162), (3890, 5581)]