81384920

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{65633}}^1$

素因数の和:65675

約数の個数: 32

約数和(自身を含む): 189025920

約数和(自身を除く): 107641000

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 65633, 131266, 262532, 328165, 525064, 656330, 1312660, 2034623, 2625320, 4069246, 8138492, 10173115, 16276984, 20346230, 40692460, 81384920]

約数ペア:

[(1, 81384920), (2, 40692460), (4, 20346230), (5, 16276984), (8, 10173115), (10, 8138492), (20, 4069246), (31, 2625320), (40, 2034623), (62, 1312660), (124, 656330), (155, 525064), (248, 328165), (310, 262532), (620, 131266), (1240, 65633)]