20561380

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{20981}}^1$

素因数の和:21004

約数の個数: 36

約数和(自身を含む): 50230908

約数和(自身を除く): 29669528

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 980, 20981, 41962, 83924, 104905, 146867, 209810, 293734, 419620, 587468, 734335, 1028069, 1468670, 2056138, 2937340, 4112276, 5140345, 10280690, 20561380]

約数ペア:

[(1, 20561380), (2, 10280690), (4, 5140345), (5, 4112276), (7, 2937340), (10, 2056138), (14, 1468670), (20, 1028069), (28, 734335), (35, 587468), (49, 419620), (70, 293734), (98, 209810), (140, 146867), (196, 104905), (245, 83924), (490, 41962), (980, 20981)]