20448640

素因数分解:

$2^7\times 5^1\times {\mathrm{89}}^1\times {\mathrm{359}}^1$

素因数の和:467

約数の個数: 64

約数和(自身を含む): 49572000

約数和(自身を除く): 29123360

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 89, 128, 160, 178, 320, 356, 359, 445, 640, 712, 718, 890, 1424, 1436, 1780, 1795, 2848, 2872, 3560, 3590, 5696, 5744, 7120, 7180, 11392, 11488, 14240, 14360, 22976, 28480, 28720, 31951, 45952, 56960, 57440, 63902, 114880, 127804, 159755, 229760, 255608, 319510, 511216, 639020, 1022432, 1278040, 2044864, 2556080, 4089728, 5112160, 10224320, 20448640]

約数ペア:

[(1, 20448640), (2, 10224320), (4, 5112160), (5, 4089728), (8, 2556080), (10, 2044864), (16, 1278040), (20, 1022432), (32, 639020), (40, 511216), (64, 319510), (80, 255608), (89, 229760), (128, 159755), (160, 127804), (178, 114880), (320, 63902), (356, 57440), (359, 56960), (445, 45952), (640, 31951), (712, 28720), (718, 28480), (890, 22976), (1424, 14360), (1436, 14240), (1780, 11488), (1795, 11392), (2848, 7180), (2872, 7120), (3560, 5744), (3590, 5696)]