21401315

素因数分解:

$5^1\times {\mathrm{13}}^2\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1$

素因数の和:124

約数の個数: 48

約数和(自身を含む): 30919680

約数和(自身を除く): 9518365

約数列:

[1, 5, 13, 19, 31, 43, 65, 95, 155, 169, 215, 247, 403, 559, 589, 817, 845, 1235, 1333, 2015, 2795, 2945, 3211, 4085, 5239, 6665, 7267, 7657, 10621, 16055, 17329, 25327, 26195, 36335, 38285, 53105, 86645, 99541, 126635, 138073, 225277, 329251, 497705, 690365, 1126385, 1646255, 4280263, 21401315]

約数ペア:

[(1, 21401315), (5, 4280263), (13, 1646255), (19, 1126385), (31, 690365), (43, 497705), (65, 329251), (95, 225277), (155, 138073), (169, 126635), (215, 99541), (247, 86645), (403, 53105), (559, 38285), (589, 36335), (817, 26195), (845, 25327), (1235, 17329), (1333, 16055), (2015, 10621), (2795, 7657), (2945, 7267), (3211, 6665), (4085, 5239)]