21981520

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{24979}}^1$

素因数の和:25003

約数の個数: 40

約数和(自身を含む): 55755360

約数和(自身を除く): 33773840

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 80, 88, 110, 176, 220, 440, 880, 24979, 49958, 99916, 124895, 199832, 249790, 274769, 399664, 499580, 549538, 999160, 1099076, 1373845, 1998320, 2198152, 2747690, 4396304, 5495380, 10990760, 21981520]

約数ペア:

[(1, 21981520), (2, 10990760), (4, 5495380), (5, 4396304), (8, 2747690), (10, 2198152), (11, 1998320), (16, 1373845), (20, 1099076), (22, 999160), (40, 549538), (44, 499580), (55, 399664), (80, 274769), (88, 249790), (110, 199832), (176, 124895), (220, 99916), (440, 49958), (880, 24979)]