18901880

素因数分解:

$2^3\times 5^1\times {\mathrm{521}}^1\times {\mathrm{907}}^1$

素因数の和:1439

約数の個数: 32

約数和(自身を含む): 42657840

約数和(自身を除く): 23755960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 521, 907, 1042, 1814, 2084, 2605, 3628, 4168, 4535, 5210, 7256, 9070, 10420, 18140, 20840, 36280, 472547, 945094, 1890188, 2362735, 3780376, 4725470, 9450940, 18901880]

約数ペア:

[(1, 18901880), (2, 9450940), (4, 4725470), (5, 3780376), (8, 2362735), (10, 1890188), (20, 945094), (40, 472547), (521, 36280), (907, 20840), (1042, 18140), (1814, 10420), (2084, 9070), (2605, 7256), (3628, 5210), (4168, 4535)]