81564400

素因数分解:

$2^4\times 5^2\times {\mathrm{203911}}^1$

素因数の和:203929

約数の個数: 30

約数和(自身を含む): 195959432

約数和(自身を除く): 114395032

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 203911, 407822, 815644, 1019555, 1631288, 2039110, 3262576, 4078220, 5097775, 8156440, 10195550, 16312880, 20391100, 40782200, 81564400]

約数ペア:

[(1, 81564400), (2, 40782200), (4, 20391100), (5, 16312880), (8, 10195550), (10, 8156440), (16, 5097775), (20, 4078220), (25, 3262576), (40, 2039110), (50, 1631288), (80, 1019555), (100, 815644), (200, 407822), (400, 203911)]