12780400

素因数分解:

$2^4\times 5^2\times {\mathrm{89}}^1\times {\mathrm{359}}^1$

素因数の和:466

約数の個数: 60

約数和(自身を含む): 31136400

約数和(自身を除く): 18356000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 89, 100, 178, 200, 356, 359, 400, 445, 712, 718, 890, 1424, 1436, 1780, 1795, 2225, 2872, 3560, 3590, 4450, 5744, 7120, 7180, 8900, 8975, 14360, 17800, 17950, 28720, 31951, 35600, 35900, 63902, 71800, 127804, 143600, 159755, 255608, 319510, 511216, 639020, 798775, 1278040, 1597550, 2556080, 3195100, 6390200, 12780400]

約数ペア:

[(1, 12780400), (2, 6390200), (4, 3195100), (5, 2556080), (8, 1597550), (10, 1278040), (16, 798775), (20, 639020), (25, 511216), (40, 319510), (50, 255608), (80, 159755), (89, 143600), (100, 127804), (178, 71800), (200, 63902), (356, 35900), (359, 35600), (400, 31951), (445, 28720), (712, 17950), (718, 17800), (890, 14360), (1424, 8975), (1436, 8900), (1780, 7180), (1795, 7120), (2225, 5744), (2872, 4450), (3560, 3590)]