19777225

素因数分解:

$5^2\times {\mathrm{13}}^2\times {\mathrm{31}}^1\times {\mathrm{151}}^1$

素因数の和:218

約数の個数: 36

約数和(自身を含む): 27593472

約数和(自身を除く): 7816247

約数列:

[1, 5, 13, 25, 31, 65, 151, 155, 169, 325, 403, 755, 775, 845, 1963, 2015, 3775, 4225, 4681, 5239, 9815, 10075, 23405, 25519, 26195, 49075, 60853, 117025, 127595, 130975, 304265, 637975, 791089, 1521325, 3955445, 19777225]

約数ペア:

[(1, 19777225), (5, 3955445), (13, 1521325), (25, 791089), (31, 637975), (65, 304265), (151, 130975), (155, 127595), (169, 117025), (325, 60853), (403, 49075), (755, 26195), (775, 25519), (845, 23405), (1963, 10075), (2015, 9815), (3775, 5239), (4225, 4681)]