21004375

素因数分解:

$5^4\times 7^1\times {\mathrm{4801}}^1$

素因数の和:4828

約数の個数: 20

約数和(自身を含む): 30002896

約数和(自身を除く): 8998521

約数列:

[1, 5, 7, 25, 35, 125, 175, 625, 875, 4375, 4801, 24005, 33607, 120025, 168035, 600125, 840175, 3000625, 4200875, 21004375]

約数ペア:

[(1, 21004375), (5, 4200875), (7, 3000625), (25, 840175), (35, 600125), (125, 168035), (175, 120025), (625, 33607), (875, 24005), (4375, 4801)]