855981

素因数分解:

$3^3\times 7^2\times {\mathrm{647}}^1$

素因数の和:670

約数の個数: 24

約数和(自身を含む): 1477440

約数和(自身を除く): 621459

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 147, 189, 441, 647, 1323, 1941, 4529, 5823, 13587, 17469, 31703, 40761, 95109, 122283, 285327, 855981]

約数ペア:

[(1, 855981), (3, 285327), (7, 122283), (9, 95109), (21, 40761), (27, 31703), (49, 17469), (63, 13587), (147, 5823), (189, 4529), (441, 1941), (647, 1323)]