21131685

素因数分解:

$3^4\times 5^1\times {\mathrm{52177}}^1$

素因数の和:52194

約数の個数: 20

約数和(自身を含む): 37881228

約数和(自身を除く): 16749543

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 52177, 156531, 260885, 469593, 782655, 1408779, 2347965, 4226337, 7043895, 21131685]

約数ペア:

[(1, 21131685), (3, 7043895), (5, 4226337), (9, 2347965), (15, 1408779), (27, 782655), (45, 469593), (81, 260885), (135, 156531), (405, 52177)]