20841821

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{443}}^1$

素因数の和:521

約数の個数: 32

約数和(自身を含む): 28643328

約数和(自身を除く): 7801507

約数列:

[1, 7, 11, 13, 47, 77, 91, 143, 329, 443, 517, 611, 1001, 3101, 3619, 4277, 4873, 5759, 6721, 20821, 34111, 40313, 47047, 63349, 145747, 229031, 270673, 443443, 1603217, 1894711, 2977403, 20841821]

約数ペア:

[(1, 20841821), (7, 2977403), (11, 1894711), (13, 1603217), (47, 443443), (77, 270673), (91, 229031), (143, 145747), (329, 63349), (443, 47047), (517, 40313), (611, 34111), (1001, 20821), (3101, 6721), (3619, 5759), (4277, 4873)]