20921859

素因数分解:

$3^2\times 7^1\times {\mathrm{313}}^1\times {\mathrm{1061}}^1$

素因数の和:1387

約数の個数: 24

約数和(自身を含む): 34680672

約数和(自身を除く): 13758813

約数列:

[1, 3, 7, 9, 21, 63, 313, 939, 1061, 2191, 2817, 3183, 6573, 7427, 9549, 19719, 22281, 66843, 332093, 996279, 2324651, 2988837, 6973953, 20921859]

約数ペア:

[(1, 20921859), (3, 6973953), (7, 2988837), (9, 2324651), (21, 996279), (63, 332093), (313, 66843), (939, 22281), (1061, 19719), (2191, 9549), (2817, 7427), (3183, 6573)]