21518060

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{131}}^1\times {\mathrm{191}}^1$

素因数の和:374

約数の個数: 48

約数和(自身を含む): 46835712

約数和(自身を除く): 25317652

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 131, 172, 191, 215, 262, 382, 430, 524, 655, 764, 860, 955, 1310, 1910, 2620, 3820, 5633, 8213, 11266, 16426, 22532, 25021, 28165, 32852, 41065, 50042, 56330, 82130, 100084, 112660, 125105, 164260, 250210, 500420, 1075903, 2151806, 4303612, 5379515, 10759030, 21518060]

約数ペア:

[(1, 21518060), (2, 10759030), (4, 5379515), (5, 4303612), (10, 2151806), (20, 1075903), (43, 500420), (86, 250210), (131, 164260), (172, 125105), (191, 112660), (215, 100084), (262, 82130), (382, 56330), (430, 50042), (524, 41065), (655, 32852), (764, 28165), (860, 25021), (955, 22532), (1310, 16426), (1910, 11266), (2620, 8213), (3820, 5633)]