21128325

素因数分解:

$3^1\times 5^2\times {\mathrm{41}}^1\times {\mathrm{6871}}^1$

素因数の和:6925

約数の個数: 24

約数和(自身を含む): 35789376

約数和(自身を除く): 14661051

約数列:

[1, 3, 5, 15, 25, 41, 75, 123, 205, 615, 1025, 3075, 6871, 20613, 34355, 103065, 171775, 281711, 515325, 845133, 1408555, 4225665, 7042775, 21128325]

約数ペア:

[(1, 21128325), (3, 7042775), (5, 4225665), (15, 1408555), (25, 845133), (41, 515325), (75, 281711), (123, 171775), (205, 103065), (615, 34355), (1025, 20613), (3075, 6871)]