20554760

素因数分解:

$2^3\times 5^1\times {\mathrm{389}}^1\times {\mathrm{1321}}^1$

素因数の和:1721

約数の個数: 32

約数和(自身を含む): 46402200

約数和(自身を除く): 25847440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 389, 778, 1321, 1556, 1945, 2642, 3112, 3890, 5284, 6605, 7780, 10568, 13210, 15560, 26420, 52840, 513869, 1027738, 2055476, 2569345, 4110952, 5138690, 10277380, 20554760]

約数ペア:

[(1, 20554760), (2, 10277380), (4, 5138690), (5, 4110952), (8, 2569345), (10, 2055476), (20, 1027738), (40, 513869), (389, 52840), (778, 26420), (1321, 15560), (1556, 13210), (1945, 10568), (2642, 7780), (3112, 6605), (3890, 5284)]