21019375

素因数分解:

$5^4\times {\mathrm{13}}^2\times {\mathrm{199}}^1$

素因数の和:245

約数の個数: 30

約数和(自身を含む): 28584600

約数和(自身を除く): 7565225

約数列:

[1, 5, 13, 25, 65, 125, 169, 199, 325, 625, 845, 995, 1625, 2587, 4225, 4975, 8125, 12935, 21125, 24875, 33631, 64675, 105625, 124375, 168155, 323375, 840775, 1616875, 4203875, 21019375]

約数ペア:

[(1, 21019375), (5, 4203875), (13, 1616875), (25, 840775), (65, 323375), (125, 168155), (169, 124375), (199, 105625), (325, 64675), (625, 33631), (845, 24875), (995, 21125), (1625, 12935), (2587, 8125), (4225, 4975)]