21078315

素因数分解:

$3^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{89}}^1\times {\mathrm{277}}^1$

素因数の和:396

約数の個数: 48

約数和(自身を含む): 39031200

約数和(自身を除く): 17952885

約数列:

[1, 3, 5, 9, 15, 19, 45, 57, 89, 95, 171, 267, 277, 285, 445, 801, 831, 855, 1335, 1385, 1691, 2493, 4005, 4155, 5073, 5263, 8455, 12465, 15219, 15789, 24653, 25365, 26315, 47367, 73959, 76095, 78945, 123265, 221877, 236835, 369795, 468407, 1109385, 1405221, 2342035, 4215663, 7026105, 21078315]

約数ペア:

[(1, 21078315), (3, 7026105), (5, 4215663), (9, 2342035), (15, 1405221), (19, 1109385), (45, 468407), (57, 369795), (89, 236835), (95, 221877), (171, 123265), (267, 78945), (277, 76095), (285, 73959), (445, 47367), (801, 26315), (831, 25365), (855, 24653), (1335, 15789), (1385, 15219), (1691, 12465), (2493, 8455), (4005, 5263), (4155, 5073)]