20990421

素因数分解:

$3^4\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{593}}^1$

素因数の和:647

約数の個数: 40

約数和(自身を含む): 34499520

約数和(自身を除く): 13509099

約数列:

[1, 3, 9, 19, 23, 27, 57, 69, 81, 171, 207, 437, 513, 593, 621, 1311, 1539, 1779, 1863, 3933, 5337, 11267, 11799, 13639, 16011, 33801, 35397, 40917, 48033, 101403, 122751, 259141, 304209, 368253, 777423, 912627, 1104759, 2332269, 6996807, 20990421]

約数ペア:

[(1, 20990421), (3, 6996807), (9, 2332269), (19, 1104759), (23, 912627), (27, 777423), (57, 368253), (69, 304209), (81, 259141), (171, 122751), (207, 101403), (437, 48033), (513, 40917), (593, 35397), (621, 33801), (1311, 16011), (1539, 13639), (1779, 11799), (1863, 11267), (3933, 5337)]