21485979

素因数分解:

$3^4\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{607}}^1$

素因数の和:661

約数の個数: 40

約数和(自身を含む): 35312640

約数和(自身を除く): 13826661

約数列:

[1, 3, 9, 19, 23, 27, 57, 69, 81, 171, 207, 437, 513, 607, 621, 1311, 1539, 1821, 1863, 3933, 5463, 11533, 11799, 13961, 16389, 34599, 35397, 41883, 49167, 103797, 125649, 265259, 311391, 376947, 795777, 934173, 1130841, 2387331, 7161993, 21485979]

約数ペア:

[(1, 21485979), (3, 7161993), (9, 2387331), (19, 1130841), (23, 934173), (27, 795777), (57, 376947), (69, 311391), (81, 265259), (171, 125649), (207, 103797), (437, 49167), (513, 41883), (607, 35397), (621, 34599), (1311, 16389), (1539, 13961), (1821, 11799), (1863, 11533), (3933, 5463)]