21985911

素因数分解:

$3^9\times {\mathrm{1117}}^1$

素因数の和:1144

約数の個数: 20

約数和(自身を含む): 33007832

約数和(自身を除く): 11021921

約数列:

[1, 3, 9, 27, 81, 243, 729, 1117, 2187, 3351, 6561, 10053, 19683, 30159, 90477, 271431, 814293, 2442879, 7328637, 21985911]

約数ペア:

[(1, 21985911), (3, 7328637), (9, 2442879), (27, 814293), (81, 271431), (243, 90477), (729, 30159), (1117, 19683), (2187, 10053), (3351, 6561)]