20111023 has 2 divisors, whose sum is σ = 20111024. Its totient is φ = 20111022.

The previous prime is 20111011. The next prime is 20111027. The reversal of 20111023 is 32011102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20111023 - 2⁵ = 20110991 is a prime.

It is a super-2 number, since 2×20111023² = 808906492213058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055511 + 10055512.

It is an arithmetic number, because the mean of its divisors is an integer number (10055512).

Almost surely, 2^20111023 is an apocalyptic number.

20111023 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111023 is an equidigital number, since it uses as much as digits as its factorization.

20111023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20111023 is about 4484.5315251428. The cubic root of 20111023 is about 271.9431064324.

Adding to 20111023 its reverse (32011102), we get a palindrome (52122125).

It can be divided in two parts, 2011102 and 3, that multiplied together give a palindrome (6033306).

The spelling of 20111023 in words is "twenty million, one hundred eleven thousand, twenty-three".