18998440

素因数分解:

$2^3\times 5^1\times {\mathrm{211}}^1\times {\mathrm{2251}}^1$

素因数の和:2473

約数の個数: 32

約数和(自身を含む): 42968160

約数和(自身を除く): 23969720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 211, 422, 844, 1055, 1688, 2110, 2251, 4220, 4502, 8440, 9004, 11255, 18008, 22510, 45020, 90040, 474961, 949922, 1899844, 2374805, 3799688, 4749610, 9499220, 18998440]

約数ペア:

[(1, 18998440), (2, 9499220), (4, 4749610), (5, 3799688), (8, 2374805), (10, 1899844), (20, 949922), (40, 474961), (211, 90040), (422, 45020), (844, 22510), (1055, 18008), (1688, 11255), (2110, 9004), (2251, 8440), (4220, 4502)]