21427960

素因数分解:

$2^3\times 5^1\times {\mathrm{79}}^1\times {\mathrm{6781}}^1$

素因数の和:6871

約数の個数: 32

約数和(自身を含む): 48830400

約数和(自身を除く): 27402440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 79, 158, 316, 395, 632, 790, 1580, 3160, 6781, 13562, 27124, 33905, 54248, 67810, 135620, 271240, 535699, 1071398, 2142796, 2678495, 4285592, 5356990, 10713980, 21427960]

約数ペア:

[(1, 21427960), (2, 10713980), (4, 5356990), (5, 4285592), (8, 2678495), (10, 2142796), (20, 1071398), (40, 535699), (79, 271240), (158, 135620), (316, 67810), (395, 54248), (632, 33905), (790, 27124), (1580, 13562), (3160, 6781)]