21395720

素因数分解:

$2^3\times 5^1\times {\mathrm{107}}^1\times {\mathrm{4999}}^1$

素因数の和:5117

約数の個数: 32

約数和(自身を含む): 48600000

約数和(自身を除く): 27204280

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 107, 214, 428, 535, 856, 1070, 2140, 4280, 4999, 9998, 19996, 24995, 39992, 49990, 99980, 199960, 534893, 1069786, 2139572, 2674465, 4279144, 5348930, 10697860, 21395720]

約数ペア:

[(1, 21395720), (2, 10697860), (4, 5348930), (5, 4279144), (8, 2674465), (10, 2139572), (20, 1069786), (40, 534893), (107, 199960), (214, 99980), (428, 49990), (535, 39992), (856, 24995), (1070, 19996), (2140, 9998), (4280, 4999)]