205656520

素因数分解:

$2^3\times 5^1\times {\mathrm{389}}^1\times {\mathrm{13217}}^1$

素因数の和:13617

約数の個数: 32

約数和(自身を含む): 463951800

約数和(自身を除く): 258295280

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 389, 778, 1556, 1945, 3112, 3890, 7780, 13217, 15560, 26434, 52868, 66085, 105736, 132170, 264340, 528680, 5141413, 10282826, 20565652, 25707065, 41131304, 51414130, 102828260, 205656520]

約数ペア:

[(1, 205656520), (2, 102828260), (4, 51414130), (5, 41131304), (8, 25707065), (10, 20565652), (20, 10282826), (40, 5141413), (389, 528680), (778, 264340), (1556, 132170), (1945, 105736), (3112, 66085), (3890, 52868), (7780, 26434), (13217, 15560)]