21821787

素因数分解:

$3^2\times {\mathrm{13}}^2\times {\mathrm{14347}}^1$

素因数の和:14379

約数の個数: 18

約数和(自身を含む): 34133892

約数和(自身を除く): 12312105

約数列:

[1, 3, 9, 13, 39, 117, 169, 507, 1521, 14347, 43041, 129123, 186511, 559533, 1678599, 2424643, 7273929, 21821787]

約数ペア:

[(1, 21821787), (3, 7273929), (9, 2424643), (13, 1678599), (39, 559533), (117, 186511), (169, 129123), (507, 43041), (1521, 14347)]