21811221

素因数分解:

$3^3\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1$

素因数の和:147

約数の個数: 64

約数和(自身を含む): 37497600

約数和(自身を除く): 15686379

約数列:

[1, 3, 9, 17, 19, 27, 41, 51, 57, 61, 123, 153, 171, 183, 323, 369, 459, 513, 549, 697, 779, 969, 1037, 1107, 1159, 1647, 2091, 2337, 2501, 2907, 3111, 3477, 6273, 7011, 7503, 8721, 9333, 10431, 13243, 18819, 19703, 21033, 22509, 27999, 31293, 39729, 42517, 47519, 59109, 67527, 119187, 127551, 142557, 177327, 357561, 382653, 427671, 531981, 807823, 1147959, 1283013, 2423469, 7270407, 21811221]

約数ペア:

[(1, 21811221), (3, 7270407), (9, 2423469), (17, 1283013), (19, 1147959), (27, 807823), (41, 531981), (51, 427671), (57, 382653), (61, 357561), (123, 177327), (153, 142557), (171, 127551), (183, 119187), (323, 67527), (369, 59109), (459, 47519), (513, 42517), (549, 39729), (697, 31293), (779, 27999), (969, 22509), (1037, 21033), (1107, 19703), (1159, 18819), (1647, 13243), (2091, 10431), (2337, 9333), (2501, 8721), (2907, 7503), (3111, 7011), (3477, 6273)]