21164840

素因数分解:

$2^3\times 5^1\times {\mathrm{529121}}^1$

素因数の和:529132

約数の個数: 16

約数和(自身を含む): 47620980

約数和(自身を除く): 26456140

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 529121, 1058242, 2116484, 2645605, 4232968, 5291210, 10582420, 21164840]

約数ペア:

[(1, 21164840), (2, 10582420), (4, 5291210), (5, 4232968), (8, 2645605), (10, 2116484), (20, 1058242), (40, 529121)]