21807963

素因数分解:

$3^2\times {\mathrm{53}}^1\times {\mathrm{131}}^1\times {\mathrm{349}}^1$

素因数の和:539

約数の個数: 24

約数和(自身を含む): 32432400

約数和(自身を除く): 10624437

約数列:

[1, 3, 9, 53, 131, 159, 349, 393, 477, 1047, 1179, 3141, 6943, 18497, 20829, 45719, 55491, 62487, 137157, 166473, 411471, 2423107, 7269321, 21807963]

約数ペア:

[(1, 21807963), (3, 7269321), (9, 2423107), (53, 411471), (131, 166473), (159, 137157), (349, 62487), (393, 55491), (477, 45719), (1047, 20829), (1179, 18497), (3141, 6943)]