399640

素因数分解:

$2^3\times 5^1\times {\mathrm{97}}^1\times {\mathrm{103}}^1$

素因数の和:211

約数の個数: 32

約数和(自身を含む): 917280

約数和(自身を除く): 517640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 97, 103, 194, 206, 388, 412, 485, 515, 776, 824, 970, 1030, 1940, 2060, 3880, 4120, 9991, 19982, 39964, 49955, 79928, 99910, 199820, 399640]

約数ペア:

[(1, 399640), (2, 199820), (4, 99910), (5, 79928), (8, 49955), (10, 39964), (20, 19982), (40, 9991), (97, 4120), (103, 3880), (194, 2060), (206, 1940), (388, 1030), (412, 970), (485, 824), (515, 776)]