21105460

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{89}}^1\times {\mathrm{167}}^1$

素因数の和:336

約数の個数: 48

約数和(自身を含む): 45722880

約数和(自身を除く): 24617420

約数列:

[1, 2, 4, 5, 10, 20, 71, 89, 142, 167, 178, 284, 334, 355, 356, 445, 668, 710, 835, 890, 1420, 1670, 1780, 3340, 6319, 11857, 12638, 14863, 23714, 25276, 29726, 31595, 47428, 59285, 59452, 63190, 74315, 118570, 126380, 148630, 237140, 297260, 1055273, 2110546, 4221092, 5276365, 10552730, 21105460]

約数ペア:

[(1, 21105460), (2, 10552730), (4, 5276365), (5, 4221092), (10, 2110546), (20, 1055273), (71, 297260), (89, 237140), (142, 148630), (167, 126380), (178, 118570), (284, 74315), (334, 63190), (355, 59452), (356, 59285), (445, 47428), (668, 31595), (710, 29726), (835, 25276), (890, 23714), (1420, 14863), (1670, 12638), (1780, 11857), (3340, 6319)]