20651560

素因数分解:

$2^3\times 5^1\times {\mathrm{89}}^1\times {\mathrm{5801}}^1$

素因数の和:5901

約数の個数: 32

約数和(自身を含む): 46996200

約数和(自身を除く): 26344640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 89, 178, 356, 445, 712, 890, 1780, 3560, 5801, 11602, 23204, 29005, 46408, 58010, 116020, 232040, 516289, 1032578, 2065156, 2581445, 4130312, 5162890, 10325780, 20651560]

約数ペア:

[(1, 20651560), (2, 10325780), (4, 5162890), (5, 4130312), (8, 2581445), (10, 2065156), (20, 1032578), (40, 516289), (89, 232040), (178, 116020), (356, 58010), (445, 46408), (712, 29005), (890, 23204), (1780, 11602), (3560, 5801)]