21291290

素因数分解:

$2^1\times 5^1\times {\mathrm{79}}^1\times {\mathrm{26951}}^1$

素因数の和:27037

約数の個数: 16

約数和(自身を含む): 38810880

約数和(自身を除く): 17519590

約数列:

[1, 2, 5, 10, 79, 158, 395, 790, 26951, 53902, 134755, 269510, 2129129, 4258258, 10645645, 21291290]

約数ペア:

[(1, 21291290), (2, 10645645), (5, 4258258), (10, 2129129), (79, 269510), (158, 134755), (395, 53902), (790, 26951)]