21118905

素因数分解:

$3^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{15139}}^1$

素因数の和:15181

約数の個数: 24

約数和(自身を含む): 37789440

約数和(自身を除く): 16670535

約数列:

[1, 3, 5, 9, 15, 31, 45, 93, 155, 279, 465, 1395, 15139, 45417, 75695, 136251, 227085, 469309, 681255, 1407927, 2346545, 4223781, 7039635, 21118905]

約数ペア:

[(1, 21118905), (3, 7039635), (5, 4223781), (9, 2346545), (15, 1407927), (31, 681255), (45, 469309), (93, 227085), (155, 136251), (279, 75695), (465, 45417), (1395, 15139)]