20010811 has 2 divisors, whose sum is σ = 20010812. Its totient is φ = 20010810.

The previous prime is 20010799. The next prime is 20010847. The reversal of 20010811 is 11801002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20010811 - 2²¹ = 17913659 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20010791 and 20010800.

It is not a weakly prime, because it can be changed into another prime (20010871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005405 + 10005406.

It is an arithmetic number, because the mean of its divisors is an integer number (10005406).

Almost surely, 2^20010811 is an apocalyptic number.

20010811 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010811 is an equidigital number, since it uses as much as digits as its factorization.

20010811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 20010811 is about 4473.3444982474. The cubic root of 20010811 is about 271.4906621309.

Adding to 20010811 its reverse (11801002), we get a palindrome (31811813).

It can be divided in two parts, 200 and 10811, that added together give a palindrome (11011).

The spelling of 20010811 in words is "twenty million, ten thousand, eight hundred eleven".