21197290

素因数分解:

$2^1\times 5^1\times {\mathrm{449}}^1\times {\mathrm{4721}}^1$

素因数の和:5177

約数の個数: 16

約数和(自身を含む): 38248200

約数和(自身を除く): 17050910

約数列:

[1, 2, 5, 10, 449, 898, 2245, 4490, 4721, 9442, 23605, 47210, 2119729, 4239458, 10598645, 21197290]

約数ペア:

[(1, 21197290), (2, 10598645), (5, 4239458), (10, 2119729), (449, 47210), (898, 23605), (2245, 9442), (4490, 4721)]