18985240

素因数分解:

$2^3\times 5^1\times {\mathrm{521}}^1\times {\mathrm{911}}^1$

素因数の和:1443

約数の個数: 32

約数和(自身を含む): 42845760

約数和(自身を除く): 23860520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 521, 911, 1042, 1822, 2084, 2605, 3644, 4168, 4555, 5210, 7288, 9110, 10420, 18220, 20840, 36440, 474631, 949262, 1898524, 2373155, 3797048, 4746310, 9492620, 18985240]

約数ペア:

[(1, 18985240), (2, 9492620), (4, 4746310), (5, 3797048), (8, 2373155), (10, 1898524), (20, 949262), (40, 474631), (521, 36440), (911, 20840), (1042, 18220), (1822, 10420), (2084, 9110), (2605, 7288), (3644, 5210), (4168, 4555)]