21328825

素因数分解:

$5^2\times 7^1\times {\mathrm{307}}^1\times {\mathrm{397}}^1$

素因数の和:721

約数の個数: 24

約数和(自身を含む): 30400832

約数和(自身を除く): 9072007

約数列:

[1, 5, 7, 25, 35, 175, 307, 397, 1535, 1985, 2149, 2779, 7675, 9925, 10745, 13895, 53725, 69475, 121879, 609395, 853153, 3046975, 4265765, 21328825]

約数ペア:

[(1, 21328825), (5, 4265765), (7, 3046975), (25, 853153), (35, 609395), (175, 121879), (307, 69475), (397, 53725), (1535, 13895), (1985, 10745), (2149, 9925), (2779, 7675)]