21705579

素因数分解:

$3^2\times 7^2\times {\mathrm{83}}^1\times {\mathrm{593}}^1$

素因数の和:696

約数の個数: 36

約数和(自身を含む): 36972936

約数和(自身を除く): 15267357

約数列:

[1, 3, 7, 9, 21, 49, 63, 83, 147, 249, 441, 581, 593, 747, 1743, 1779, 4067, 4151, 5229, 5337, 12201, 12453, 29057, 36603, 37359, 49219, 87171, 147657, 261513, 344533, 442971, 1033599, 2411731, 3100797, 7235193, 21705579]

約数ペア:

[(1, 21705579), (3, 7235193), (7, 3100797), (9, 2411731), (21, 1033599), (49, 442971), (63, 344533), (83, 261513), (147, 147657), (249, 87171), (441, 49219), (581, 37359), (593, 36603), (747, 29057), (1743, 12453), (1779, 12201), (4067, 5337), (4151, 5229)]