81656540

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{97}}^1\times {\mathrm{859}}^1$

素因数の和:979

約数の個数: 72

約数和(自身を含む): 201766320

約数和(自身を除く): 120109780

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 97, 98, 140, 194, 196, 245, 388, 485, 490, 679, 859, 970, 980, 1358, 1718, 1940, 2716, 3395, 3436, 4295, 4753, 6013, 6790, 8590, 9506, 12026, 13580, 17180, 19012, 23765, 24052, 30065, 42091, 47530, 60130, 83323, 84182, 95060, 120260, 166646, 168364, 210455, 333292, 416615, 420910, 583261, 833230, 841820, 1166522, 1666460, 2333044, 2916305, 4082827, 5832610, 8165654, 11665220, 16331308, 20414135, 40828270, 81656540]

約数ペア:

[(1, 81656540), (2, 40828270), (4, 20414135), (5, 16331308), (7, 11665220), (10, 8165654), (14, 5832610), (20, 4082827), (28, 2916305), (35, 2333044), (49, 1666460), (70, 1166522), (97, 841820), (98, 833230), (140, 583261), (194, 420910), (196, 416615), (245, 333292), (388, 210455), (485, 168364), (490, 166646), (679, 120260), (859, 95060), (970, 84182), (980, 83323), (1358, 60130), (1718, 47530), (1940, 42091), (2716, 30065), (3395, 24052), (3436, 23765), (4295, 19012), (4753, 17180), (6013, 13580), (6790, 12026), (8590, 9506)]