21039785

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{71}}^1\times {\mathrm{97}}^1$

素因数の和:233

約数の個数: 32

約数和(自身を含む): 28449792

約数和(自身を除く): 7410007

約数列:

[1, 5, 13, 47, 65, 71, 97, 235, 355, 485, 611, 923, 1261, 3055, 3337, 4559, 4615, 6305, 6887, 16685, 22795, 34435, 43381, 59267, 89531, 216905, 296335, 323689, 447655, 1618445, 4207957, 21039785]

約数ペア:

[(1, 21039785), (5, 4207957), (13, 1618445), (47, 447655), (65, 323689), (71, 296335), (97, 216905), (235, 89531), (355, 59267), (485, 43381), (611, 34435), (923, 22795), (1261, 16685), (3055, 6887), (3337, 6305), (4559, 4615)]