81605020

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{18803}}^1$

素因数の和:18850

約数の個数: 48

約数和(自身を含む): 202180608

約数和(自身を除く): 120575588

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 31, 35, 62, 70, 124, 140, 155, 217, 310, 434, 620, 868, 1085, 2170, 4340, 18803, 37606, 75212, 94015, 131621, 188030, 263242, 376060, 526484, 582893, 658105, 1165786, 1316210, 2331572, 2632420, 2914465, 4080251, 5828930, 8160502, 11657860, 16321004, 20401255, 40802510, 81605020]

約数ペア:

[(1, 81605020), (2, 40802510), (4, 20401255), (5, 16321004), (7, 11657860), (10, 8160502), (14, 5828930), (20, 4080251), (28, 2914465), (31, 2632420), (35, 2331572), (62, 1316210), (70, 1165786), (124, 658105), (140, 582893), (155, 526484), (217, 376060), (310, 263242), (434, 188030), (620, 131621), (868, 94015), (1085, 75212), (2170, 37606), (4340, 18803)]