20405120

素因数分解:

$2^7\times 5^1\times {\mathrm{31883}}^1$

素因数の和:31902

約数の個数: 32

約数和(自身を含む): 48782520

約数和(自身を除く): 28377400

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 31883, 63766, 127532, 159415, 255064, 318830, 510128, 637660, 1020256, 1275320, 2040512, 2550640, 4081024, 5101280, 10202560, 20405120]

約数ペア:

[(1, 20405120), (2, 10202560), (4, 5101280), (5, 4081024), (8, 2550640), (10, 2040512), (16, 1275320), (20, 1020256), (32, 637660), (40, 510128), (64, 318830), (80, 255064), (128, 159415), (160, 127532), (320, 63766), (640, 31883)]