20818540

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{61231}}^1$

素因数の和:61257

約数の個数: 24

約数和(自身を含む): 46291392

約数和(自身を除く): 25472852

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 340, 61231, 122462, 244924, 306155, 612310, 1040927, 1224620, 2081854, 4163708, 5204635, 10409270, 20818540]

約数ペア:

[(1, 20818540), (2, 10409270), (4, 5204635), (5, 4163708), (10, 2081854), (17, 1224620), (20, 1040927), (34, 612310), (68, 306155), (85, 244924), (170, 122462), (340, 61231)]