18420440

素因数分解:

$2^3\times 5^1\times {\mathrm{439}}^1\times {\mathrm{1049}}^1$

素因数の和:1499

約数の個数: 32

約数和(自身を含む): 41580000

約数和(自身を除く): 23159560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 439, 878, 1049, 1756, 2098, 2195, 3512, 4196, 4390, 5245, 8392, 8780, 10490, 17560, 20980, 41960, 460511, 921022, 1842044, 2302555, 3684088, 4605110, 9210220, 18420440]

約数ペア:

[(1, 18420440), (2, 9210220), (4, 4605110), (5, 3684088), (8, 2302555), (10, 1842044), (20, 921022), (40, 460511), (439, 41960), (878, 20980), (1049, 17560), (1756, 10490), (2098, 8780), (2195, 8392), (3512, 5245), (4196, 4390)]