19780840

素因数分解:

$2^3\times 5^1\times {\mathrm{494521}}^1$

素因数の和:494532

約数の個数: 16

約数和(自身を含む): 44506980

約数和(自身を除く): 24726140

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 494521, 989042, 1978084, 2472605, 3956168, 4945210, 9890420, 19780840]

約数ペア:

[(1, 19780840), (2, 9890420), (4, 4945210), (5, 3956168), (8, 2472605), (10, 1978084), (20, 989042), (40, 494521)]