21208775

素因数分解:

$5^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{7129}}^1$

素因数の和:7163

約数の個数: 24

約数和(自身を含む): 31828320

約数和(自身を除く): 10619545

約数列:

[1, 5, 7, 17, 25, 35, 85, 119, 175, 425, 595, 2975, 7129, 35645, 49903, 121193, 178225, 249515, 605965, 848351, 1247575, 3029825, 4241755, 21208775]

約数ペア:

[(1, 21208775), (5, 4241755), (7, 3029825), (17, 1247575), (25, 848351), (35, 605965), (85, 249515), (119, 178225), (175, 121193), (425, 49903), (595, 35645), (2975, 7129)]