20681660

素因数分解:

$2^2\times 5^1\times {\mathrm{53}}^1\times {\mathrm{109}}^1\times {\mathrm{179}}^1$

素因数の和:350

約数の個数: 48

約数和(自身を含む): 44906400

約数和(自身を除く): 24224740

約数列:

[1, 2, 4, 5, 10, 20, 53, 106, 109, 179, 212, 218, 265, 358, 436, 530, 545, 716, 895, 1060, 1090, 1790, 2180, 3580, 5777, 9487, 11554, 18974, 19511, 23108, 28885, 37948, 39022, 47435, 57770, 78044, 94870, 97555, 115540, 189740, 195110, 390220, 1034083, 2068166, 4136332, 5170415, 10340830, 20681660]

約数ペア:

[(1, 20681660), (2, 10340830), (4, 5170415), (5, 4136332), (10, 2068166), (20, 1034083), (53, 390220), (106, 195110), (109, 189740), (179, 115540), (212, 97555), (218, 94870), (265, 78044), (358, 57770), (436, 47435), (530, 39022), (545, 37948), (716, 28885), (895, 23108), (1060, 19511), (1090, 18974), (1790, 11554), (2180, 9487), (3580, 5777)]