21856569

素因数分解:

$3^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{107}}^1\times {\mathrm{137}}^1$

素因数の和:325

約数の個数: 32

約数和(自身を含む): 34338816

約数和(自身を除く): 12482247

約数列:

[1, 3, 7, 21, 71, 107, 137, 213, 321, 411, 497, 749, 959, 1491, 2247, 2877, 7597, 9727, 14659, 22791, 29181, 43977, 53179, 68089, 102613, 159537, 204267, 307839, 1040789, 3122367, 7285523, 21856569]

約数ペア:

[(1, 21856569), (3, 7285523), (7, 3122367), (21, 1040789), (71, 307839), (107, 204267), (137, 159537), (213, 102613), (321, 68089), (411, 53179), (497, 43977), (749, 29181), (959, 22791), (1491, 14659), (2247, 9727), (2877, 7597)]