21581440

素因数分解:

$2^7\times 5^1\times {\mathrm{33721}}^1$

素因数の和:33740

約数の個数: 32

約数和(自身を含む): 51594660

約数和(自身を除く): 30013220

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 33721, 67442, 134884, 168605, 269768, 337210, 539536, 674420, 1079072, 1348840, 2158144, 2697680, 4316288, 5395360, 10790720, 21581440]

約数ペア:

[(1, 21581440), (2, 10790720), (4, 5395360), (5, 4316288), (8, 2697680), (10, 2158144), (16, 1348840), (20, 1079072), (32, 674420), (40, 539536), (64, 337210), (80, 269768), (128, 168605), (160, 134884), (320, 67442), (640, 33721)]