21263907

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{137}}^1\times {\mathrm{389}}^1$

素因数の和:555

約数の個数: 32

約数和(自身を含む): 34444800

約数和(自身を除く): 13180893

約数列:

[1, 3, 7, 19, 21, 57, 133, 137, 389, 399, 411, 959, 1167, 2603, 2723, 2877, 7391, 7809, 8169, 18221, 22173, 51737, 53293, 54663, 155211, 159879, 373051, 1012567, 1119153, 3037701, 7087969, 21263907]

約数ペア:

[(1, 21263907), (3, 7087969), (7, 3037701), (19, 1119153), (21, 1012567), (57, 373051), (133, 159879), (137, 155211), (389, 54663), (399, 53293), (411, 51737), (959, 22173), (1167, 18221), (2603, 8169), (2723, 7809), (2877, 7391)]