20489680

素因数分解:

$2^4\times 5^1\times {\mathrm{256121}}^1$

素因数の和:256134

約数の個数: 20

約数和(自身を含む): 47638692

約数和(自身を除く): 27149012

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 256121, 512242, 1024484, 1280605, 2048968, 2561210, 4097936, 5122420, 10244840, 20489680]

約数ペア:

[(1, 20489680), (2, 10244840), (4, 5122420), (5, 4097936), (8, 2561210), (10, 2048968), (16, 1280605), (20, 1024484), (40, 512242), (80, 256121)]