21213055

素因数分解:

$5^1\times {\mathrm{61}}^1\times {\mathrm{157}}^1\times {\mathrm{443}}^1$

素因数の和:666

約数の個数: 16

約数和(自身を含む): 26096544

約数和(自身を除く): 4883489

約数列:

[1, 5, 61, 157, 305, 443, 785, 2215, 9577, 27023, 47885, 69551, 135115, 347755, 4242611, 21213055]

約数ペア:

[(1, 21213055), (5, 4242611), (61, 347755), (157, 135115), (305, 69551), (443, 47885), (785, 27023), (2215, 9577)]