396400

素因数分解:

$2^4\times 5^2\times {\mathrm{991}}^1$

素因数の和:1009

約数の個数: 30

約数和(自身を含む): 953312

約数和(自身を除く): 556912

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 991, 1982, 3964, 4955, 7928, 9910, 15856, 19820, 24775, 39640, 49550, 79280, 99100, 198200, 396400]

約数ペア:

[(1, 396400), (2, 198200), (4, 99100), (5, 79280), (8, 49550), (10, 39640), (16, 24775), (20, 19820), (25, 15856), (40, 9910), (50, 7928), (80, 4955), (100, 3964), (200, 1982), (400, 991)]