21695121

素因数分解:

$3^4\times 7^1\times {\mathrm{83}}^1\times {\mathrm{461}}^1$

素因数の和:563

約数の個数: 40

約数和(自身を含む): 37566144

約数和(自身を除く): 15871023

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 83, 189, 249, 461, 567, 581, 747, 1383, 1743, 2241, 3227, 4149, 5229, 6723, 9681, 12447, 15687, 29043, 37341, 38263, 47061, 87129, 114789, 261387, 267841, 344367, 803523, 1033101, 2410569, 3099303, 7231707, 21695121]

約数ペア:

[(1, 21695121), (3, 7231707), (7, 3099303), (9, 2410569), (21, 1033101), (27, 803523), (63, 344367), (81, 267841), (83, 261387), (189, 114789), (249, 87129), (461, 47061), (567, 38263), (581, 37341), (747, 29043), (1383, 15687), (1743, 12447), (2241, 9681), (3227, 6723), (4149, 5229)]