21385707

素因数分解:

$3^1\times 7^4\times {\mathrm{2969}}^1$

素因数の和:3000

約数の個数: 20

約数和(自身を含む): 33275880

約数和(自身を除く): 11890173

約数列:

[1, 3, 7, 21, 49, 147, 343, 1029, 2401, 2969, 7203, 8907, 20783, 62349, 145481, 436443, 1018367, 3055101, 7128569, 21385707]

約数ペア:

[(1, 21385707), (3, 7128569), (7, 3055101), (21, 1018367), (49, 436443), (147, 145481), (343, 62349), (1029, 20783), (2401, 8907), (2969, 7203)]