21412505

素因数分解:

$5^1\times {\mathrm{101}}^1\times {\mathrm{109}}^1\times {\mathrm{389}}^1$

素因数の和:604

約数の個数: 16

約数和(自身を含む): 26254800

約数和(自身を除く): 4842295

約数列:

[1, 5, 101, 109, 389, 505, 545, 1945, 11009, 39289, 42401, 55045, 196445, 212005, 4282501, 21412505]

約数ペア:

[(1, 21412505), (5, 4282501), (101, 212005), (109, 196445), (389, 55045), (505, 42401), (545, 39289), (1945, 11009)]