20005011 has 24 divisors (see below), whose sum is σ = 31640336. Its totient is φ = 12104640.

The previous prime is 20005003. The next prime is 20005021. The reversal of 20005011 is 11050002.

It is a happy number.

It is not a de Polignac number, because 20005011 - 2³ = 20005003 is a prime.

It is a super-2 number, since 2×20005011² = 800400930220242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20004984 and 20005002.

It is not an unprimeable number, because it can be changed into a prime (20005021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5736 + ... + 8538.

Almost surely, 2^20005011 is an apocalyptic number.

20005011 is a deficient number, since it is larger than the sum of its proper divisors (11635325).

20005011 is a wasteful number, since it uses less digits than its factorization.

20005011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2883 (or 2880 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 20005011 is about 4472.6961667433. The cubic root of 20005011 is about 271.4644296776.

Adding to 20005011 its reverse (11050002), we get a palindrome (31055013).

The spelling of 20005011 in words is "twenty million, five thousand, eleven".