19991080

素因数分解:

$2^3\times 5^1\times {\mathrm{311}}^1\times {\mathrm{1607}}^1$

素因数の和:1929

約数の個数: 32

約数和(自身を含む): 45152640

約数和(自身を除く): 25161560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 311, 622, 1244, 1555, 1607, 2488, 3110, 3214, 6220, 6428, 8035, 12440, 12856, 16070, 32140, 64280, 499777, 999554, 1999108, 2498885, 3998216, 4997770, 9995540, 19991080]

約数ペア:

[(1, 19991080), (2, 9995540), (4, 4997770), (5, 3998216), (8, 2498885), (10, 1999108), (20, 999554), (40, 499777), (311, 64280), (622, 32140), (1244, 16070), (1555, 12856), (1607, 12440), (2488, 8035), (3110, 6428), (3214, 6220)]