21385870

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{433}}^1\times {\mathrm{449}}^1$

素因数の和:900

約数の個数: 32

約数和(自身を含む): 42184800

約数和(自身を除く): 20798930

約数列:

[1, 2, 5, 10, 11, 22, 55, 110, 433, 449, 866, 898, 2165, 2245, 4330, 4490, 4763, 4939, 9526, 9878, 23815, 24695, 47630, 49390, 194417, 388834, 972085, 1944170, 2138587, 4277174, 10692935, 21385870]

約数ペア:

[(1, 21385870), (2, 10692935), (5, 4277174), (10, 2138587), (11, 1944170), (22, 972085), (55, 388834), (110, 194417), (433, 49390), (449, 47630), (866, 24695), (898, 23815), (2165, 9878), (2245, 9526), (4330, 4939), (4490, 4763)]