20551120

素因数分解:

$2^4\times 5^1\times {\mathrm{256889}}^1$

素因数の和:256902

約数の個数: 20

約数和(自身を含む): 47781540

約数和(自身を除く): 27230420

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 256889, 513778, 1027556, 1284445, 2055112, 2568890, 4110224, 5137780, 10275560, 20551120]

約数ペア:

[(1, 20551120), (2, 10275560), (4, 5137780), (5, 4110224), (8, 2568890), (10, 2055112), (16, 1284445), (20, 1027556), (40, 513778), (80, 256889)]