21352540

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{1367}}^1$

素因数の和:1458

約数の個数: 48

約数和(自身を含む): 49641984

約数和(自身を除く): 28289444

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 71, 110, 142, 220, 284, 355, 710, 781, 1367, 1420, 1562, 2734, 3124, 3905, 5468, 6835, 7810, 13670, 15037, 15620, 27340, 30074, 60148, 75185, 97057, 150370, 194114, 300740, 388228, 485285, 970570, 1067627, 1941140, 2135254, 4270508, 5338135, 10676270, 21352540]

約数ペア:

[(1, 21352540), (2, 10676270), (4, 5338135), (5, 4270508), (10, 2135254), (11, 1941140), (20, 1067627), (22, 970570), (44, 485285), (55, 388228), (71, 300740), (110, 194114), (142, 150370), (220, 97057), (284, 75185), (355, 60148), (710, 30074), (781, 27340), (1367, 15620), (1420, 15037), (1562, 13670), (2734, 7810), (3124, 6835), (3905, 5468)]