21495280

素因数分解:

$2^4\times 5^1\times {\mathrm{89}}^1\times {\mathrm{3019}}^1$

素因数の和:3121

約数の個数: 40

約数和(自身を含む): 50554800

約数和(自身を除く): 29059520

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 89, 178, 356, 445, 712, 890, 1424, 1780, 3019, 3560, 6038, 7120, 12076, 15095, 24152, 30190, 48304, 60380, 120760, 241520, 268691, 537382, 1074764, 1343455, 2149528, 2686910, 4299056, 5373820, 10747640, 21495280]

約数ペア:

[(1, 21495280), (2, 10747640), (4, 5373820), (5, 4299056), (8, 2686910), (10, 2149528), (16, 1343455), (20, 1074764), (40, 537382), (80, 268691), (89, 241520), (178, 120760), (356, 60380), (445, 48304), (712, 30190), (890, 24152), (1424, 15095), (1780, 12076), (3019, 7120), (3560, 6038)]