20880040

素因数分解:

$2^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{4789}}^1$

素因数の和:4909

約数の個数: 32

約数和(自身を含む): 47421000

約数和(自身を除く): 26540960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 109, 218, 436, 545, 872, 1090, 2180, 4360, 4789, 9578, 19156, 23945, 38312, 47890, 95780, 191560, 522001, 1044002, 2088004, 2610005, 4176008, 5220010, 10440020, 20880040]

約数ペア:

[(1, 20880040), (2, 10440020), (4, 5220010), (5, 4176008), (8, 2610005), (10, 2088004), (20, 1044002), (40, 522001), (109, 191560), (218, 95780), (436, 47890), (545, 38312), (872, 23945), (1090, 19156), (2180, 9578), (4360, 4789)]