19980620

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{90821}}^1$

素因数の和:90841

約数の個数: 24

約数和(自身を含む): 45774288

約数和(自身を除く): 25793668

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 90821, 181642, 363284, 454105, 908210, 999031, 1816420, 1998062, 3996124, 4995155, 9990310, 19980620]

約数ペア:

[(1, 19980620), (2, 9990310), (4, 4995155), (5, 3996124), (10, 1998062), (11, 1816420), (20, 999031), (22, 908210), (44, 454105), (55, 363284), (110, 181642), (220, 90821)]