18780903

素因数分解:

$3^4\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{593}}^1$

素因数の和:645

約数の個数: 40

約数和(自身を含む): 31049568

約数和(自身を除く): 12268665

約数列:

[1, 3, 9, 17, 23, 27, 51, 69, 81, 153, 207, 391, 459, 593, 621, 1173, 1377, 1779, 1863, 3519, 5337, 10081, 10557, 13639, 16011, 30243, 31671, 40917, 48033, 90729, 122751, 231863, 272187, 368253, 695589, 816561, 1104759, 2086767, 6260301, 18780903]

約数ペア:

[(1, 18780903), (3, 6260301), (9, 2086767), (17, 1104759), (23, 816561), (27, 695589), (51, 368253), (69, 272187), (81, 231863), (153, 122751), (207, 90729), (391, 48033), (459, 40917), (593, 31671), (621, 30243), (1173, 16011), (1377, 13639), (1779, 10557), (1863, 10081), (3519, 5337)]