21166480

素因数分解:

$2^4\times 5^1\times {\mathrm{264581}}^1$

素因数の和:264594

約数の個数: 20

約数和(自身を含む): 49212252

約数和(自身を除く): 28045772

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 264581, 529162, 1058324, 1322905, 2116648, 2645810, 4233296, 5291620, 10583240, 21166480]

約数ペア:

[(1, 21166480), (2, 10583240), (4, 5291620), (5, 4233296), (8, 2645810), (10, 2116648), (16, 1322905), (20, 1058324), (40, 529162), (80, 264581)]