21991340

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{157081}}^1$

素因数の和:157097

約数の個数: 24

約数和(自身を含む): 52779552

約数和(自身を除く): 30788212

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 157081, 314162, 628324, 785405, 1099567, 1570810, 2199134, 3141620, 4398268, 5497835, 10995670, 21991340]

約数ペア:

[(1, 21991340), (2, 10995670), (4, 5497835), (5, 4398268), (7, 3141620), (10, 2199134), (14, 1570810), (20, 1099567), (28, 785405), (35, 628324), (70, 314162), (140, 157081)]