21685815

素因数分解:

$3^2\times 5^1\times {\mathrm{547}}^1\times {\mathrm{881}}^1$

素因数の和:1439

約数の個数: 24

約数和(自身を含む): 37700208

約数和(自身を除く): 16014393

約数列:

[1, 3, 5, 9, 15, 45, 547, 881, 1641, 2643, 2735, 4405, 4923, 7929, 8205, 13215, 24615, 39645, 481907, 1445721, 2409535, 4337163, 7228605, 21685815]

約数ペア:

[(1, 21685815), (3, 7228605), (5, 4337163), (9, 2409535), (15, 1445721), (45, 481907), (547, 39645), (881, 24615), (1641, 13215), (2643, 8205), (2735, 7929), (4405, 4923)]