21123020

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{79}}^1\times {\mathrm{461}}^1$

素因数の和:578

約数の個数: 48

約数和(自身を含む): 46569600

約数和(自身を除く): 25446580

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 79, 116, 145, 158, 290, 316, 395, 461, 580, 790, 922, 1580, 1844, 2291, 2305, 4582, 4610, 9164, 9220, 11455, 13369, 22910, 26738, 36419, 45820, 53476, 66845, 72838, 133690, 145676, 182095, 267380, 364190, 728380, 1056151, 2112302, 4224604, 5280755, 10561510, 21123020]

約数ペア:

[(1, 21123020), (2, 10561510), (4, 5280755), (5, 4224604), (10, 2112302), (20, 1056151), (29, 728380), (58, 364190), (79, 267380), (116, 182095), (145, 145676), (158, 133690), (290, 72838), (316, 66845), (395, 53476), (461, 45820), (580, 36419), (790, 26738), (922, 22910), (1580, 13369), (1844, 11455), (2291, 9220), (2305, 9164), (4582, 4610)]