21287809

素因数分解:

${\mathrm{19}}^2\times {\mathrm{109}}^1\times {\mathrm{541}}^1$

素因数の和:688

約数の個数: 12

約数和(自身を含む): 22715220

約数和(自身を除く): 1427411

約数列:

[1, 19, 109, 361, 541, 2071, 10279, 39349, 58969, 195301, 1120411, 21287809]

約数ペア:

[(1, 21287809), (19, 1120411), (109, 195301), (361, 58969), (541, 39349), (2071, 10279)]