21081890

素因数分解:

$2^1\times 5^1\times {\mathrm{1361}}^1\times {\mathrm{1549}}^1$

素因数の和:2917

約数の個数: 16

約数和(自身を含む): 37999800

約数和(自身を除く): 16917910

約数列:

[1, 2, 5, 10, 1361, 1549, 2722, 3098, 6805, 7745, 13610, 15490, 2108189, 4216378, 10540945, 21081890]

約数ペア:

[(1, 21081890), (2, 10540945), (5, 4216378), (10, 2108189), (1361, 15490), (1549, 13610), (2722, 7745), (3098, 6805)]