21756987

素因数分解:

$3^2\times 7^1\times {\mathrm{281}}^1\times {\mathrm{1229}}^1$

素因数の和:1523

約数の個数: 24

約数和(自身を含む): 36073440

約数和(自身を除く): 14316453

約数列:

[1, 3, 7, 9, 21, 63, 281, 843, 1229, 1967, 2529, 3687, 5901, 8603, 11061, 17703, 25809, 77427, 345349, 1036047, 2417443, 3108141, 7252329, 21756987]

約数ペア:

[(1, 21756987), (3, 7252329), (7, 3108141), (9, 2417443), (21, 1036047), (63, 345349), (281, 77427), (843, 25809), (1229, 17703), (1967, 11061), (2529, 8603), (3687, 5901)]