18915678

素因数分解:

$2^1\times 3^2\times {\mathrm{19}}^2\times {\mathrm{41}}^1\times {\mathrm{71}}^1$

素因数の和:158

約数の個数: 72

約数和(自身を含む): 44933616

約数和(自身を除く): 26017938

約数列:

[1, 2, 3, 6, 9, 18, 19, 38, 41, 57, 71, 82, 114, 123, 142, 171, 213, 246, 342, 361, 369, 426, 639, 722, 738, 779, 1083, 1278, 1349, 1558, 2166, 2337, 2698, 2911, 3249, 4047, 4674, 5822, 6498, 7011, 8094, 8733, 12141, 14022, 14801, 17466, 24282, 25631, 26199, 29602, 44403, 51262, 52398, 55309, 76893, 88806, 110618, 133209, 153786, 165927, 230679, 266418, 331854, 461358, 497781, 995562, 1050871, 2101742, 3152613, 6305226, 9457839, 18915678]

約数ペア:

[(1, 18915678), (2, 9457839), (3, 6305226), (6, 3152613), (9, 2101742), (18, 1050871), (19, 995562), (38, 497781), (41, 461358), (57, 331854), (71, 266418), (82, 230679), (114, 165927), (123, 153786), (142, 133209), (171, 110618), (213, 88806), (246, 76893), (342, 55309), (361, 52398), (369, 51262), (426, 44403), (639, 29602), (722, 26199), (738, 25631), (779, 24282), (1083, 17466), (1278, 14801), (1349, 14022), (1558, 12141), (2166, 8733), (2337, 8094), (2698, 7011), (2911, 6498), (3249, 5822), (4047, 4674)]