21009425

素因数分解:

$5^2\times {\mathrm{41}}^1\times {\mathrm{103}}^1\times {\mathrm{199}}^1$

素因数の和:353

約数の個数: 24

約数和(自身を含む): 27081600

約数和(自身を除く): 6072175

約数列:

[1, 5, 25, 41, 103, 199, 205, 515, 995, 1025, 2575, 4223, 4975, 8159, 20497, 21115, 40795, 102485, 105575, 203975, 512425, 840377, 4201885, 21009425]

約数ペア:

[(1, 21009425), (5, 4201885), (25, 840377), (41, 512425), (103, 203975), (199, 105575), (205, 102485), (515, 40795), (995, 21115), (1025, 20497), (2575, 8159), (4223, 4975)]