19670780

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{257}}^1$

素因数の和:398

約数の個数: 48

約数和(自身を含む): 42910560

約数和(自身を除く): 23239780

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 89, 172, 178, 215, 257, 356, 430, 445, 514, 860, 890, 1028, 1285, 1780, 2570, 3827, 5140, 7654, 11051, 15308, 19135, 22102, 22873, 38270, 44204, 45746, 55255, 76540, 91492, 110510, 114365, 221020, 228730, 457460, 983539, 1967078, 3934156, 4917695, 9835390, 19670780]

約数ペア:

[(1, 19670780), (2, 9835390), (4, 4917695), (5, 3934156), (10, 1967078), (20, 983539), (43, 457460), (86, 228730), (89, 221020), (172, 114365), (178, 110510), (215, 91492), (257, 76540), (356, 55255), (430, 45746), (445, 44204), (514, 38270), (860, 22873), (890, 22102), (1028, 19135), (1285, 15308), (1780, 11051), (2570, 7654), (3827, 5140)]