21017680

素因数分解:

$2^4\times 5^1\times {\mathrm{53}}^1\times {\mathrm{4957}}^1$

素因数の和:5023

約数の個数: 40

約数和(自身を含む): 49798152

約数和(自身を除く): 28780472

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 53, 80, 106, 212, 265, 424, 530, 848, 1060, 2120, 4240, 4957, 9914, 19828, 24785, 39656, 49570, 79312, 99140, 198280, 262721, 396560, 525442, 1050884, 1313605, 2101768, 2627210, 4203536, 5254420, 10508840, 21017680]

約数ペア:

[(1, 21017680), (2, 10508840), (4, 5254420), (5, 4203536), (8, 2627210), (10, 2101768), (16, 1313605), (20, 1050884), (40, 525442), (53, 396560), (80, 262721), (106, 198280), (212, 99140), (265, 79312), (424, 49570), (530, 39656), (848, 24785), (1060, 19828), (2120, 9914), (4240, 4957)]