21318479

素因数分解:

$7^4\times {\mathrm{13}}^1\times {\mathrm{683}}^1$

素因数の和:724

約数の個数: 20

約数和(自身を含む): 26822376

約数和(自身を除く): 5503897

約数列:

[1, 7, 13, 49, 91, 343, 637, 683, 2401, 4459, 4781, 8879, 31213, 33467, 62153, 234269, 435071, 1639883, 3045497, 21318479]

約数ペア:

[(1, 21318479), (7, 3045497), (13, 1639883), (49, 435071), (91, 234269), (343, 62153), (637, 33467), (683, 31213), (2401, 8879), (4459, 4781)]