20485985

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{71}}^1\times {\mathrm{193}}^1$

素因数の和:305

約数の個数: 32

約数和(自身を含む): 28159488

約数和(自身を除く): 7673503

約数列:

[1, 5, 13, 23, 65, 71, 115, 193, 299, 355, 923, 965, 1495, 1633, 2509, 4439, 4615, 8165, 12545, 13703, 21229, 22195, 57707, 68515, 106145, 178139, 288535, 315169, 890695, 1575845, 4097197, 20485985]

約数ペア:

[(1, 20485985), (5, 4097197), (13, 1575845), (23, 890695), (65, 315169), (71, 288535), (115, 178139), (193, 106145), (299, 68515), (355, 57707), (923, 22195), (965, 21229), (1495, 13703), (1633, 12545), (2509, 8165), (4439, 4615)]