21131305

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{10487}}^1$

素因数の和:10536

約数の個数: 16

約数和(自身を含む): 28191744

約数和(自身を除く): 7060439

約数列:

[1, 5, 13, 31, 65, 155, 403, 2015, 10487, 52435, 136331, 325097, 681655, 1625485, 4226261, 21131305]

約数ペア:

[(1, 21131305), (5, 4226261), (13, 1625485), (31, 681655), (65, 325097), (155, 136331), (403, 52435), (2015, 10487)]