21520971

素因数分解:

$3^4\times {\mathrm{47}}^1\times {\mathrm{5653}}^1$

素因数の和:5712

約数の個数: 20

約数和(自身を含む): 32838432

約数和(自身を除く): 11317461

約数列:

[1, 3, 9, 27, 47, 81, 141, 423, 1269, 3807, 5653, 16959, 50877, 152631, 265691, 457893, 797073, 2391219, 7173657, 21520971]

約数ペア:

[(1, 21520971), (3, 7173657), (9, 2391219), (27, 797073), (47, 457893), (81, 265691), (141, 152631), (423, 50877), (1269, 16959), (3807, 5653)]