21389475

素因数分解:

$3^1\times 5^2\times {\mathrm{53}}^1\times {\mathrm{5381}}^1$

素因数の和:5447

約数の個数: 24

約数和(自身を含む): 36037872

約数和(自身を除く): 14648397

約数列:

[1, 3, 5, 15, 25, 53, 75, 159, 265, 795, 1325, 3975, 5381, 16143, 26905, 80715, 134525, 285193, 403575, 855579, 1425965, 4277895, 7129825, 21389475]

約数ペア:

[(1, 21389475), (3, 7129825), (5, 4277895), (15, 1425965), (25, 855579), (53, 403575), (75, 285193), (159, 134525), (265, 80715), (795, 26905), (1325, 16143), (3975, 5381)]