21026875

素因数分解:

$5^4\times {\mathrm{17}}^1\times {\mathrm{1979}}^1$

素因数の和:2016

約数の個数: 20

約数和(自身を含む): 27834840

約数和(自身を除く): 6807965

約数列:

[1, 5, 17, 25, 85, 125, 425, 625, 1979, 2125, 9895, 10625, 33643, 49475, 168215, 247375, 841075, 1236875, 4205375, 21026875]

約数ペア:

[(1, 21026875), (5, 4205375), (17, 1236875), (25, 841075), (85, 247375), (125, 168215), (425, 49475), (625, 33643), (1979, 10625), (2125, 9895)]