78880540

素因数分解:

$2^2\times 5^1\times {\mathrm{1973}}^1\times {\mathrm{1999}}^1$

素因数の和:3981

約数の個数: 24

約数和(自身を含む): 165816000

約数和(自身を除く): 86935460

約数列:

[1, 2, 4, 5, 10, 20, 1973, 1999, 3946, 3998, 7892, 7996, 9865, 9995, 19730, 19990, 39460, 39980, 3944027, 7888054, 15776108, 19720135, 39440270, 78880540]

約数ペア:

[(1, 78880540), (2, 39440270), (4, 19720135), (5, 15776108), (10, 7888054), (20, 3944027), (1973, 39980), (1999, 39460), (3946, 19990), (3998, 19730), (7892, 9995), (7996, 9865)]