20405800

素因数分解:

$2^3\times 5^2\times {\mathrm{257}}^1\times {\mathrm{397}}^1$

素因数の和:670

約数の個数: 48

約数和(自身を含む): 47748060

約数和(自身を除く): 27342260

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 200, 257, 397, 514, 794, 1028, 1285, 1588, 1985, 2056, 2570, 3176, 3970, 5140, 6425, 7940, 9925, 10280, 12850, 15880, 19850, 25700, 39700, 51400, 79400, 102029, 204058, 408116, 510145, 816232, 1020290, 2040580, 2550725, 4081160, 5101450, 10202900, 20405800]

約数ペア:

[(1, 20405800), (2, 10202900), (4, 5101450), (5, 4081160), (8, 2550725), (10, 2040580), (20, 1020290), (25, 816232), (40, 510145), (50, 408116), (100, 204058), (200, 102029), (257, 79400), (397, 51400), (514, 39700), (794, 25700), (1028, 19850), (1285, 15880), (1588, 12850), (1985, 10280), (2056, 9925), (2570, 7940), (3176, 6425), (3970, 5140)]