20953985

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{10399}}^1$

素因数の和:10448

約数の個数: 16

約数和(自身を含む): 27955200

約数和(自身を除く): 7001215

約数列:

[1, 5, 13, 31, 65, 155, 403, 2015, 10399, 51995, 135187, 322369, 675935, 1611845, 4190797, 20953985]

約数ペア:

[(1, 20953985), (5, 4190797), (13, 1611845), (31, 675935), (65, 322369), (155, 135187), (403, 51995), (2015, 10399)]