28720215

素因数分解:

$3^2\times 5^1\times {\mathrm{23}}^1\times {\mathrm{27749}}^1$

素因数の和:27783

約数の個数: 24

約数和(自身を含む): 51948000

約数和(自身を除く): 23227785

約数列:

[1, 3, 5, 9, 15, 23, 45, 69, 115, 207, 345, 1035, 27749, 83247, 138745, 249741, 416235, 638227, 1248705, 1914681, 3191135, 5744043, 9573405, 28720215]

約数ペア:

[(1, 28720215), (3, 9573405), (5, 5744043), (9, 3191135), (15, 1914681), (23, 1248705), (45, 638227), (69, 416235), (115, 249741), (207, 138745), (345, 83247), (1035, 27749)]