21037720

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{137}}^1\times {\mathrm{349}}^1$

素因数の和:508

約数の個数: 64

約数和(自身を含む): 52164000

約数和(自身を除く): 31126280

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 137, 220, 274, 349, 440, 548, 685, 698, 1096, 1370, 1396, 1507, 1745, 2740, 2792, 3014, 3490, 3839, 5480, 6028, 6980, 7535, 7678, 12056, 13960, 15070, 15356, 19195, 30140, 30712, 38390, 47813, 60280, 76780, 95626, 153560, 191252, 239065, 382504, 478130, 525943, 956260, 1051886, 1912520, 2103772, 2629715, 4207544, 5259430, 10518860, 21037720]

約数ペア:

[(1, 21037720), (2, 10518860), (4, 5259430), (5, 4207544), (8, 2629715), (10, 2103772), (11, 1912520), (20, 1051886), (22, 956260), (40, 525943), (44, 478130), (55, 382504), (88, 239065), (110, 191252), (137, 153560), (220, 95626), (274, 76780), (349, 60280), (440, 47813), (548, 38390), (685, 30712), (698, 30140), (1096, 19195), (1370, 15356), (1396, 15070), (1507, 13960), (1745, 12056), (2740, 7678), (2792, 7535), (3014, 6980), (3490, 6028), (3839, 5480)]