21260500

素因数分解:

$2^2\times 5^3\times {\mathrm{101}}^1\times {\mathrm{421}}^1$

素因数の和:541

約数の個数: 48

約数和(自身を含む): 47004048

約数和(自身を除く): 25743548

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 101, 125, 202, 250, 404, 421, 500, 505, 842, 1010, 1684, 2020, 2105, 2525, 4210, 5050, 8420, 10100, 10525, 12625, 21050, 25250, 42100, 42521, 50500, 52625, 85042, 105250, 170084, 210500, 212605, 425210, 850420, 1063025, 2126050, 4252100, 5315125, 10630250, 21260500]

約数ペア:

[(1, 21260500), (2, 10630250), (4, 5315125), (5, 4252100), (10, 2126050), (20, 1063025), (25, 850420), (50, 425210), (100, 212605), (101, 210500), (125, 170084), (202, 105250), (250, 85042), (404, 52625), (421, 50500), (500, 42521), (505, 42100), (842, 25250), (1010, 21050), (1684, 12625), (2020, 10525), (2105, 10100), (2525, 8420), (4210, 5050)]