21156760

素因数分解:

$2^3\times 5^1\times {\mathrm{401}}^1\times {\mathrm{1319}}^1$

素因数の和:1731

約数の個数: 32

約数和(自身を含む): 47757600

約数和(自身を除く): 26600840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 401, 802, 1319, 1604, 2005, 2638, 3208, 4010, 5276, 6595, 8020, 10552, 13190, 16040, 26380, 52760, 528919, 1057838, 2115676, 2644595, 4231352, 5289190, 10578380, 21156760]

約数ペア:

[(1, 21156760), (2, 10578380), (4, 5289190), (5, 4231352), (8, 2644595), (10, 2115676), (20, 1057838), (40, 528919), (401, 52760), (802, 26380), (1319, 16040), (1604, 13190), (2005, 10552), (2638, 8020), (3208, 6595), (4010, 5276)]