21081940

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{79}}^1\times {\mathrm{1213}}^1$

素因数の和:1312

約数の個数: 48

約数和(自身を含む): 48948480

約数和(自身を除く): 27866540

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 79, 110, 158, 220, 316, 395, 790, 869, 1213, 1580, 1738, 2426, 3476, 4345, 4852, 6065, 8690, 12130, 13343, 17380, 24260, 26686, 53372, 66715, 95827, 133430, 191654, 266860, 383308, 479135, 958270, 1054097, 1916540, 2108194, 4216388, 5270485, 10540970, 21081940]

約数ペア:

[(1, 21081940), (2, 10540970), (4, 5270485), (5, 4216388), (10, 2108194), (11, 1916540), (20, 1054097), (22, 958270), (44, 479135), (55, 383308), (79, 266860), (110, 191654), (158, 133430), (220, 95827), (316, 66715), (395, 53372), (790, 26686), (869, 24260), (1213, 17380), (1580, 13343), (1738, 12130), (2426, 8690), (3476, 6065), (4345, 4852)]