21747505

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19681}}^1$

素因数の和:19716

約数の個数: 16

約数和(自身を含む): 29759184

約数和(自身を除く): 8011679

約数列:

[1, 5, 13, 17, 65, 85, 221, 1105, 19681, 98405, 255853, 334577, 1279265, 1672885, 4349501, 21747505]

約数ペア:

[(1, 21747505), (5, 4349501), (13, 1672885), (17, 1279265), (65, 334577), (85, 255853), (221, 98405), (1105, 19681)]