19959875

素因数分解:

$5^3\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{173}}^1$

素因数の和:272

約数の個数: 32

約数和(自身を含む): 27361152

約数和(自身を除く): 7401277

約数列:

[1, 5, 13, 25, 65, 71, 125, 173, 325, 355, 865, 923, 1625, 1775, 2249, 4325, 4615, 8875, 11245, 12283, 21625, 23075, 56225, 61415, 115375, 159679, 281125, 307075, 798395, 1535375, 3991975, 19959875]

約数ペア:

[(1, 19959875), (5, 3991975), (13, 1535375), (25, 798395), (65, 307075), (71, 281125), (125, 159679), (173, 115375), (325, 61415), (355, 56225), (865, 23075), (923, 21625), (1625, 12283), (1775, 11245), (2249, 8875), (4325, 4615)]