20991780

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{139}}^1\times {\mathrm{839}}^1$

素因数の和:993

約数の個数: 72

約数和(自身を含む): 64209600

約数和(自身を除く): 43217820

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 139, 180, 278, 417, 556, 695, 834, 839, 1251, 1390, 1668, 1678, 2085, 2502, 2517, 2780, 3356, 4170, 4195, 5004, 5034, 6255, 7551, 8340, 8390, 10068, 12510, 12585, 15102, 16780, 25020, 25170, 30204, 37755, 50340, 75510, 116621, 151020, 233242, 349863, 466484, 583105, 699726, 1049589, 1166210, 1399452, 1749315, 2099178, 2332420, 3498630, 4198356, 5247945, 6997260, 10495890, 20991780]

約数ペア:

[(1, 20991780), (2, 10495890), (3, 6997260), (4, 5247945), (5, 4198356), (6, 3498630), (9, 2332420), (10, 2099178), (12, 1749315), (15, 1399452), (18, 1166210), (20, 1049589), (30, 699726), (36, 583105), (45, 466484), (60, 349863), (90, 233242), (139, 151020), (180, 116621), (278, 75510), (417, 50340), (556, 37755), (695, 30204), (834, 25170), (839, 25020), (1251, 16780), (1390, 15102), (1668, 12585), (1678, 12510), (2085, 10068), (2502, 8390), (2517, 8340), (2780, 7551), (3356, 6255), (4170, 5034), (4195, 5004)]