21027560

素因数分解:

$2^3\times 5^1\times {\mathrm{521}}^1\times {\mathrm{1009}}^1$

素因数の和:1541

約数の個数: 32

約数和(自身を含む): 47449800

約数和(自身を除く): 26422240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 521, 1009, 1042, 2018, 2084, 2605, 4036, 4168, 5045, 5210, 8072, 10090, 10420, 20180, 20840, 40360, 525689, 1051378, 2102756, 2628445, 4205512, 5256890, 10513780, 21027560]

約数ペア:

[(1, 21027560), (2, 10513780), (4, 5256890), (5, 4205512), (8, 2628445), (10, 2102756), (20, 1051378), (40, 525689), (521, 40360), (1009, 20840), (1042, 20180), (2018, 10420), (2084, 10090), (2605, 8072), (4036, 5210), (4168, 5045)]