20340920

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{79}}^1\times {\mathrm{157}}^1$

素因数の和:288

約数の個数: 64

約数和(自身を含む): 47779200

約数和(自身を除く): 27438280

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 79, 82, 157, 158, 164, 205, 314, 316, 328, 395, 410, 628, 632, 785, 790, 820, 1256, 1570, 1580, 1640, 3140, 3160, 3239, 6280, 6437, 6478, 12403, 12874, 12956, 16195, 24806, 25748, 25912, 32185, 32390, 49612, 51496, 62015, 64370, 64780, 99224, 124030, 128740, 129560, 248060, 257480, 496120, 508523, 1017046, 2034092, 2542615, 4068184, 5085230, 10170460, 20340920]

約数ペア:

[(1, 20340920), (2, 10170460), (4, 5085230), (5, 4068184), (8, 2542615), (10, 2034092), (20, 1017046), (40, 508523), (41, 496120), (79, 257480), (82, 248060), (157, 129560), (158, 128740), (164, 124030), (205, 99224), (314, 64780), (316, 64370), (328, 62015), (395, 51496), (410, 49612), (628, 32390), (632, 32185), (785, 25912), (790, 25748), (820, 24806), (1256, 16195), (1570, 12956), (1580, 12874), (1640, 12403), (3140, 6478), (3160, 6437), (3239, 6280)]