20591991

素因数分解:

$3^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{17203}}^1$

素因数の和:17235

約数の個数: 24

約数和(自身を含む): 35784320

約数和(自身を除く): 15192329

約数列:

[1, 3, 7, 9, 19, 21, 57, 63, 133, 171, 399, 1197, 17203, 51609, 120421, 154827, 326857, 361263, 980571, 1083789, 2287999, 2941713, 6863997, 20591991]

約数ペア:

[(1, 20591991), (3, 6863997), (7, 2941713), (9, 2287999), (19, 1083789), (21, 980571), (57, 361263), (63, 326857), (133, 154827), (171, 120421), (399, 51609), (1197, 17203)]