20640440

素因数分解:

$2^3\times 5^1\times {\mathrm{83}}^1\times {\mathrm{6217}}^1$

素因数の和:6311

約数の個数: 32

約数和(自身を含む): 47008080

約数和(自身を除く): 26367640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 83, 166, 332, 415, 664, 830, 1660, 3320, 6217, 12434, 24868, 31085, 49736, 62170, 124340, 248680, 516011, 1032022, 2064044, 2580055, 4128088, 5160110, 10320220, 20640440]

約数ペア:

[(1, 20640440), (2, 10320220), (4, 5160110), (5, 4128088), (8, 2580055), (10, 2064044), (20, 1032022), (40, 516011), (83, 248680), (166, 124340), (332, 62170), (415, 49736), (664, 31085), (830, 24868), (1660, 12434), (3320, 6217)]