21402405

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{101}}^1\times {\mathrm{277}}^1$

素因数の和:406

約数の個数: 48

約数和(自身を含む): 39811824

約数和(自身を除く): 18409419

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 85, 101, 153, 255, 277, 303, 505, 765, 831, 909, 1385, 1515, 1717, 2493, 4155, 4545, 4709, 5151, 8585, 12465, 14127, 15453, 23545, 25755, 27977, 42381, 70635, 77265, 83931, 139885, 211905, 251793, 419655, 475609, 1258965, 1426827, 2378045, 4280481, 7134135, 21402405]

約数ペア:

[(1, 21402405), (3, 7134135), (5, 4280481), (9, 2378045), (15, 1426827), (17, 1258965), (45, 475609), (51, 419655), (85, 251793), (101, 211905), (153, 139885), (255, 83931), (277, 77265), (303, 70635), (505, 42381), (765, 27977), (831, 25755), (909, 23545), (1385, 15453), (1515, 14127), (1717, 12465), (2493, 8585), (4155, 5151), (4545, 4709)]