21161205

素因数分解:

$3^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{593}}^1$

素因数の和:678

約数の個数: 48

約数和(自身を含む): 40216176

約数和(自身を除く): 19054971

約数列:

[1, 3, 5, 9, 13, 15, 39, 45, 61, 65, 117, 183, 195, 305, 549, 585, 593, 793, 915, 1779, 2379, 2745, 2965, 3965, 5337, 7137, 7709, 8895, 11895, 23127, 26685, 35685, 36173, 38545, 69381, 108519, 115635, 180865, 325557, 346905, 470249, 542595, 1410747, 1627785, 2351245, 4232241, 7053735, 21161205]

約数ペア:

[(1, 21161205), (3, 7053735), (5, 4232241), (9, 2351245), (13, 1627785), (15, 1410747), (39, 542595), (45, 470249), (61, 346905), (65, 325557), (117, 180865), (183, 115635), (195, 108519), (305, 69381), (549, 38545), (585, 36173), (593, 35685), (793, 26685), (915, 23127), (1779, 11895), (2379, 8895), (2745, 7709), (2965, 7137), (3965, 5337)]