20111020233 has 16 divisors (see below), whose sum is σ = 26927683200. Its totient is φ = 13350902400.

The previous prime is 20111020207. The next prime is 20111020273. The reversal of 20111020233 is 33202011102.

It is not a de Polignac number, because 20111020233 - 2¹² = 20111016137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20111020273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2053773 + ... + 2063541.

It is an arithmetic number, because the mean of its divisors is an integer number (1682980200).

Almost surely, 2^20111020233 is an apocalyptic number.

It is an amenable number.

20111020233 is a deficient number, since it is larger than the sum of its proper divisors (6816662967).

20111020233 is a wasteful number, since it uses less digits than its factorization.

20111020233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12592.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20111020233 its reverse (33202011102), we get a palindrome (53313031335).

The spelling of 20111020233 in words is "twenty billion, one hundred eleven million, twenty thousand, two hundred thirty-three".