18181891

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{73}}^1$

素因数の和:140

約数の個数: 48

約数和(自身を含む): 25510464

約数和(自身を除く): 7328573

約数列:

[1, 7, 13, 17, 23, 49, 73, 91, 119, 161, 221, 299, 391, 511, 637, 833, 949, 1127, 1241, 1547, 1679, 2093, 2737, 3577, 5083, 6643, 8687, 10829, 11753, 14651, 16133, 19159, 21827, 28543, 35581, 46501, 60809, 82271, 112931, 152789, 199801, 249067, 371059, 790517, 1069523, 1398607, 2597413, 18181891]

約数ペア:

[(1, 18181891), (7, 2597413), (13, 1398607), (17, 1069523), (23, 790517), (49, 371059), (73, 249067), (91, 199801), (119, 152789), (161, 112931), (221, 82271), (299, 60809), (391, 46501), (511, 35581), (637, 28543), (833, 21827), (949, 19159), (1127, 16133), (1241, 14651), (1547, 11753), (1679, 10829), (2093, 8687), (2737, 6643), (3577, 5083)]