21395480

素因数分解:

$2^3\times 5^1\times {\mathrm{277}}^1\times {\mathrm{1931}}^1$

素因数の和:2219

約数の個数: 32

約数和(自身を含む): 48338640

約数和(自身を除く): 26943160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 277, 554, 1108, 1385, 1931, 2216, 2770, 3862, 5540, 7724, 9655, 11080, 15448, 19310, 38620, 77240, 534887, 1069774, 2139548, 2674435, 4279096, 5348870, 10697740, 21395480]

約数ペア:

[(1, 21395480), (2, 10697740), (4, 5348870), (5, 4279096), (8, 2674435), (10, 2139548), (20, 1069774), (40, 534887), (277, 77240), (554, 38620), (1108, 19310), (1385, 15448), (1931, 11080), (2216, 9655), (2770, 7724), (3862, 5540)]