21273291

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{173}}^1\times {\mathrm{1051}}^1$

素因数の和:1243

約数の個数: 24

約数和(自身を含む): 33314736

約数和(自身を除く): 12041445

約数列:

[1, 3, 9, 13, 39, 117, 173, 519, 1051, 1557, 2249, 3153, 6747, 9459, 13663, 20241, 40989, 122967, 181823, 545469, 1636407, 2363699, 7091097, 21273291]

約数ペア:

[(1, 21273291), (3, 7091097), (9, 2363699), (13, 1636407), (39, 545469), (117, 181823), (173, 122967), (519, 40989), (1051, 20241), (1557, 13663), (2249, 9459), (3153, 6747)]