20987865

素因数分解:

$3^2\times 5^1\times {\mathrm{73}}^1\times {\mathrm{6389}}^1$

素因数の和:6473

約数の個数: 24

約数和(自身を含む): 36883080

約数和(自身を除く): 15895215

約数列:

[1, 3, 5, 9, 15, 45, 73, 219, 365, 657, 1095, 3285, 6389, 19167, 31945, 57501, 95835, 287505, 466397, 1399191, 2331985, 4197573, 6995955, 20987865]

約数ペア:

[(1, 20987865), (3, 6995955), (5, 4197573), (9, 2331985), (15, 1399191), (45, 466397), (73, 287505), (219, 95835), (365, 57501), (657, 31945), (1095, 19167), (3285, 6389)]