21195760

素因数分解:

$2^4\times 5^1\times {\mathrm{53}}^1\times {\mathrm{4999}}^1$

素因数の和:5065

約数の個数: 40

約数和(自身を含む): 50220000

約数和(自身を除く): 29024240

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 53, 80, 106, 212, 265, 424, 530, 848, 1060, 2120, 4240, 4999, 9998, 19996, 24995, 39992, 49990, 79984, 99980, 199960, 264947, 399920, 529894, 1059788, 1324735, 2119576, 2649470, 4239152, 5298940, 10597880, 21195760]

約数ペア:

[(1, 21195760), (2, 10597880), (4, 5298940), (5, 4239152), (8, 2649470), (10, 2119576), (16, 1324735), (20, 1059788), (40, 529894), (53, 399920), (80, 264947), (106, 199960), (212, 99980), (265, 79984), (424, 49990), (530, 39992), (848, 24995), (1060, 19996), (2120, 9998), (4240, 4999)]