21657640

素因数分解:

$2^3\times 5^1\times {\mathrm{73}}^1\times {\mathrm{7417}}^1$

素因数の和:7501

約数の個数: 32

約数和(自身を含む): 49403880

約数和(自身を除く): 27746240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 73, 146, 292, 365, 584, 730, 1460, 2920, 7417, 14834, 29668, 37085, 59336, 74170, 148340, 296680, 541441, 1082882, 2165764, 2707205, 4331528, 5414410, 10828820, 21657640]

約数ペア:

[(1, 21657640), (2, 10828820), (4, 5414410), (5, 4331528), (8, 2707205), (10, 2165764), (20, 1082882), (40, 541441), (73, 296680), (146, 148340), (292, 74170), (365, 59336), (584, 37085), (730, 29668), (1460, 14834), (2920, 7417)]