20210440

素因数分解:

$2^3\times 5^1\times {\mathrm{199}}^1\times {\mathrm{2539}}^1$

素因数の和:2749

約数の個数: 32

約数和(自身を含む): 45720000

約数和(自身を除く): 25509560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 199, 398, 796, 995, 1592, 1990, 2539, 3980, 5078, 7960, 10156, 12695, 20312, 25390, 50780, 101560, 505261, 1010522, 2021044, 2526305, 4042088, 5052610, 10105220, 20210440]

約数ペア:

[(1, 20210440), (2, 10105220), (4, 5052610), (5, 4042088), (8, 2526305), (10, 2021044), (20, 1010522), (40, 505261), (199, 101560), (398, 50780), (796, 25390), (995, 20312), (1592, 12695), (1990, 10156), (2539, 7960), (3980, 5078)]