21333160

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{79}}^1\times {\mathrm{157}}^1$

素因数の和:290

約数の個数: 64

約数和(自身を含む): 50054400

約数和(自身を除く): 28721240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 79, 86, 157, 158, 172, 215, 314, 316, 344, 395, 430, 628, 632, 785, 790, 860, 1256, 1570, 1580, 1720, 3140, 3160, 3397, 6280, 6751, 6794, 12403, 13502, 13588, 16985, 24806, 27004, 27176, 33755, 33970, 49612, 54008, 62015, 67510, 67940, 99224, 124030, 135020, 135880, 248060, 270040, 496120, 533329, 1066658, 2133316, 2666645, 4266632, 5333290, 10666580, 21333160]

約数ペア:

[(1, 21333160), (2, 10666580), (4, 5333290), (5, 4266632), (8, 2666645), (10, 2133316), (20, 1066658), (40, 533329), (43, 496120), (79, 270040), (86, 248060), (157, 135880), (158, 135020), (172, 124030), (215, 99224), (314, 67940), (316, 67510), (344, 62015), (395, 54008), (430, 49612), (628, 33970), (632, 33755), (785, 27176), (790, 27004), (860, 24806), (1256, 16985), (1570, 13588), (1580, 13502), (1720, 12403), (3140, 6794), (3160, 6751), (3397, 6280)]