20102011 has 4 divisors (see below), whose sum is σ = 20147832. Its totient is φ = 20056192.

The previous prime is 20102009. The next prime is 20102029. The reversal of 20102011 is 11020102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11020102 = 2 ⋅5510051.

It is a cyclic number.

It is not a de Polignac number, because 20102011 - 2¹ = 20102009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101985 and 20102003.

It is not an unprimeable number, because it can be changed into a prime (20102111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22246 + ... + 23131.

It is an arithmetic number, because the mean of its divisors is an integer number (5036958).

Almost surely, 2^20102011 is an apocalyptic number.

20102011 is a deficient number, since it is larger than the sum of its proper divisors (45821).

20102011 is an equidigital number, since it uses as much as digits as its factorization.

20102011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45820.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 20102011 is about 4483.5266253252. The cubic root of 20102011 is about 271.9024799986.

Adding to 20102011 its reverse (11020102), we get a palindrome (31122113).

The spelling of 20102011 in words is "twenty million, one hundred two thousand, eleven".