20991784

素因数分解:

$2^3\times {\mathrm{11}}^1\times {\mathrm{113}}^1\times {\mathrm{2111}}^1$

素因数の和:2241

約数の個数: 32

約数和(自身を含む): 43338240

約数和(自身を除く): 22346456

約数列:

[1, 2, 4, 8, 11, 22, 44, 88, 113, 226, 452, 904, 1243, 2111, 2486, 4222, 4972, 8444, 9944, 16888, 23221, 46442, 92884, 185768, 238543, 477086, 954172, 1908344, 2623973, 5247946, 10495892, 20991784]

約数ペア:

[(1, 20991784), (2, 10495892), (4, 5247946), (8, 2623973), (11, 1908344), (22, 954172), (44, 477086), (88, 238543), (113, 185768), (226, 92884), (452, 46442), (904, 23221), (1243, 16888), (2111, 9944), (2486, 8444), (4222, 4972)]