21268120

素因数分解:

$2^3\times 5^1\times {\mathrm{197}}^1\times {\mathrm{2699}}^1$

素因数の和:2907

約数の個数: 32

約数和(自身を含む): 48114000

約数和(自身を除く): 26845880

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 197, 394, 788, 985, 1576, 1970, 2699, 3940, 5398, 7880, 10796, 13495, 21592, 26990, 53980, 107960, 531703, 1063406, 2126812, 2658515, 4253624, 5317030, 10634060, 21268120]

約数ペア:

[(1, 21268120), (2, 10634060), (4, 5317030), (5, 4253624), (8, 2658515), (10, 2126812), (20, 1063406), (40, 531703), (197, 107960), (394, 53980), (788, 26990), (985, 21592), (1576, 13495), (1970, 10796), (2699, 7880), (3940, 5398)]