20686705

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{97}}^1\times {\mathrm{193}}^1$

素因数の和:325

約数の個数: 32

約数和(自身を含む): 28746144

約数和(自身を除く): 8059439

約数列:

[1, 5, 13, 17, 65, 85, 97, 193, 221, 485, 965, 1105, 1261, 1649, 2509, 3281, 6305, 8245, 12545, 16405, 18721, 21437, 42653, 93605, 107185, 213265, 243373, 318257, 1216865, 1591285, 4137341, 20686705]

約数ペア:

[(1, 20686705), (5, 4137341), (13, 1591285), (17, 1216865), (65, 318257), (85, 243373), (97, 213265), (193, 107185), (221, 93605), (485, 42653), (965, 21437), (1105, 18721), (1261, 16405), (1649, 12545), (2509, 8245), (3281, 6305)]