21684897

素因数分解:

$3^2\times {\mathrm{13}}^2\times {\mathrm{53}}^1\times {\mathrm{269}}^1$

素因数の和:354

約数の個数: 36

約数和(自身を含む): 34685820

約数和(自身を除く): 13000923

約数列:

[1, 3, 9, 13, 39, 53, 117, 159, 169, 269, 477, 507, 689, 807, 1521, 2067, 2421, 3497, 6201, 8957, 10491, 14257, 26871, 31473, 42771, 45461, 80613, 128313, 136383, 185341, 409149, 556023, 1668069, 2409433, 7228299, 21684897]

約数ペア:

[(1, 21684897), (3, 7228299), (9, 2409433), (13, 1668069), (39, 556023), (53, 409149), (117, 185341), (159, 136383), (169, 128313), (269, 80613), (477, 45461), (507, 42771), (689, 31473), (807, 26871), (1521, 14257), (2067, 10491), (2421, 8957), (3497, 6201)]