21528880

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{8681}}^1$

素因数の和:8725

約数の個数: 40

約数和(自身を含む): 51675264

約数和(自身を除く): 30146384

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 8681, 17362, 34724, 43405, 69448, 86810, 138896, 173620, 269111, 347240, 538222, 694480, 1076444, 1345555, 2152888, 2691110, 4305776, 5382220, 10764440, 21528880]

約数ペア:

[(1, 21528880), (2, 10764440), (4, 5382220), (5, 4305776), (8, 2691110), (10, 2152888), (16, 1345555), (20, 1076444), (31, 694480), (40, 538222), (62, 347240), (80, 269111), (124, 173620), (155, 138896), (248, 86810), (310, 69448), (496, 43405), (620, 34724), (1240, 17362), (2480, 8681)]