21089981

素因数分解:

${\mathrm{11}}^1\times {\mathrm{19}}^2\times {\mathrm{47}}^1\times {\mathrm{113}}^1$

素因数の和:209

約数の個数: 24

約数和(自身を含む): 25017984

約数和(自身を除く): 3928003

約数列:

[1, 11, 19, 47, 113, 209, 361, 517, 893, 1243, 2147, 3971, 5311, 9823, 16967, 23617, 40793, 58421, 100909, 186637, 448723, 1109999, 1917271, 21089981]

約数ペア:

[(1, 21089981), (11, 1917271), (19, 1109999), (47, 448723), (113, 186637), (209, 100909), (361, 58421), (517, 40793), (893, 23617), (1243, 16967), (2147, 9823), (3971, 5311)]