21025557

素因数分解:

$3^2\times 7^5\times {\mathrm{139}}^1$

素因数の和:180

約数の個数: 36

約数和(自身を含む): 35686560

約数和(自身を除く): 14661003

約数列:

[1, 3, 7, 9, 21, 49, 63, 139, 147, 343, 417, 441, 973, 1029, 1251, 2401, 2919, 3087, 6811, 7203, 8757, 16807, 20433, 21609, 47677, 50421, 61299, 143031, 151263, 333739, 429093, 1001217, 2336173, 3003651, 7008519, 21025557]

約数ペア:

[(1, 21025557), (3, 7008519), (7, 3003651), (9, 2336173), (21, 1001217), (49, 429093), (63, 333739), (139, 151263), (147, 143031), (343, 61299), (417, 50421), (441, 47677), (973, 21609), (1029, 20433), (1251, 16807), (2401, 8757), (2919, 7203), (3087, 6811)]