21257140

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{103}}^1\times {\mathrm{607}}^1$

素因数の和:736

約数の個数: 48

約数和(自身を含む): 47803392

約数和(自身を除く): 26546252

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 103, 170, 206, 340, 412, 515, 607, 1030, 1214, 1751, 2060, 2428, 3035, 3502, 6070, 7004, 8755, 10319, 12140, 17510, 20638, 35020, 41276, 51595, 62521, 103190, 125042, 206380, 250084, 312605, 625210, 1062857, 1250420, 2125714, 4251428, 5314285, 10628570, 21257140]

約数ペア:

[(1, 21257140), (2, 10628570), (4, 5314285), (5, 4251428), (10, 2125714), (17, 1250420), (20, 1062857), (34, 625210), (68, 312605), (85, 250084), (103, 206380), (170, 125042), (206, 103190), (340, 62521), (412, 51595), (515, 41276), (607, 35020), (1030, 20638), (1214, 17510), (1751, 12140), (2060, 10319), (2428, 8755), (3035, 7004), (3502, 6070)]