21778280

素因数分解:

$2^3\times 5^1\times {\mathrm{673}}^1\times {\mathrm{809}}^1$

素因数の和:1493

約数の個数: 32

約数和(自身を含む): 49134600

約数和(自身を除く): 27356320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 673, 809, 1346, 1618, 2692, 3236, 3365, 4045, 5384, 6472, 6730, 8090, 13460, 16180, 26920, 32360, 544457, 1088914, 2177828, 2722285, 4355656, 5444570, 10889140, 21778280]

約数ペア:

[(1, 21778280), (2, 10889140), (4, 5444570), (5, 4355656), (8, 2722285), (10, 2177828), (20, 1088914), (40, 544457), (673, 32360), (809, 26920), (1346, 16180), (1618, 13460), (2692, 8090), (3236, 6730), (3365, 6472), (4045, 5384)]