20708428

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{71}}^2\times {\mathrm{79}}^1$

素因数の和:238

約数の個数: 36

約数和(自身を含む): 40085920

約数和(自身を除く): 19377492

約数列:

[1, 2, 4, 13, 26, 52, 71, 79, 142, 158, 284, 316, 923, 1027, 1846, 2054, 3692, 4108, 5041, 5609, 10082, 11218, 20164, 22436, 65533, 72917, 131066, 145834, 262132, 291668, 398239, 796478, 1592956, 5177107, 10354214, 20708428]

約数ペア:

[(1, 20708428), (2, 10354214), (4, 5177107), (13, 1592956), (26, 796478), (52, 398239), (71, 291668), (79, 262132), (142, 145834), (158, 131066), (284, 72917), (316, 65533), (923, 22436), (1027, 20164), (1846, 11218), (2054, 10082), (3692, 5609), (4108, 5041)]