20989880

素因数分解:

$2^3\times 5^1\times {\mathrm{409}}^1\times {\mathrm{1283}}^1$

素因数の和:1703

約数の個数: 32

約数和(自身を含む): 47379600

約数和(自身を除く): 26389720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 409, 818, 1283, 1636, 2045, 2566, 3272, 4090, 5132, 6415, 8180, 10264, 12830, 16360, 25660, 51320, 524747, 1049494, 2098988, 2623735, 4197976, 5247470, 10494940, 20989880]

約数ペア:

[(1, 20989880), (2, 10494940), (4, 5247470), (5, 4197976), (8, 2623735), (10, 2098988), (20, 1049494), (40, 524747), (409, 51320), (818, 25660), (1283, 16360), (1636, 12830), (2045, 10264), (2566, 8180), (3272, 6415), (4090, 5132)]