21390345

素因数分解:

$3^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{83}}^2$

素因数の和:203

約数の個数: 48

約数和(自身を含む): 40164480

約数和(自身を除く): 18774135

約数列:

[1, 3, 5, 9, 15, 23, 27, 45, 69, 83, 115, 135, 207, 249, 345, 415, 621, 747, 1035, 1245, 1909, 2241, 3105, 3735, 5727, 6889, 9545, 11205, 17181, 20667, 28635, 34445, 51543, 62001, 85905, 103335, 158447, 186003, 257715, 310005, 475341, 792235, 930015, 1426023, 2376705, 4278069, 7130115, 21390345]

約数ペア:

[(1, 21390345), (3, 7130115), (5, 4278069), (9, 2376705), (15, 1426023), (23, 930015), (27, 792235), (45, 475341), (69, 310005), (83, 257715), (115, 186003), (135, 158447), (207, 103335), (249, 85905), (345, 62001), (415, 51543), (621, 34445), (747, 28635), (1035, 20667), (1245, 17181), (1909, 11205), (2241, 9545), (3105, 6889), (3735, 5727)]