20720120

素因数分解:

$2^3\times 5^1\times {\mathrm{79}}^2\times {\mathrm{83}}^1$

素因数の和:252

約数の個数: 48

約数和(自身を含む): 47786760

約数和(自身を除く): 27066640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 79, 83, 158, 166, 316, 332, 395, 415, 632, 664, 790, 830, 1580, 1660, 3160, 3320, 6241, 6557, 12482, 13114, 24964, 26228, 31205, 32785, 49928, 52456, 62410, 65570, 124820, 131140, 249640, 262280, 518003, 1036006, 2072012, 2590015, 4144024, 5180030, 10360060, 20720120]

約数ペア:

[(1, 20720120), (2, 10360060), (4, 5180030), (5, 4144024), (8, 2590015), (10, 2072012), (20, 1036006), (40, 518003), (79, 262280), (83, 249640), (158, 131140), (166, 124820), (316, 65570), (332, 62410), (395, 52456), (415, 49928), (632, 32785), (664, 31205), (790, 26228), (830, 24964), (1580, 13114), (1660, 12482), (3160, 6557), (3320, 6241)]