20810690233 has 4 divisors (see below), whose sum is σ = 22034848500. Its totient is φ = 19586531968.

The previous prime is 20810690231. The next prime is 20810690269. The reversal of 20810690233 is 33209601802.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13612355584 + 7198334649 = 116672^2 + 84843^2 .

It is a cyclic number.

It is not a de Polignac number, because 20810690233 - 2¹ = 20810690231 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20810690231) 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, 612079108 + ... + 612079141.

It is an arithmetic number, because the mean of its divisors is an integer number (5508712125).

Almost surely, 2^20810690233 is an apocalyptic number.

It is an amenable number.

20810690233 is a deficient number, since it is larger than the sum of its proper divisors (1224158267).

20810690233 is a wasteful number, since it uses less digits than its factorization.

20810690233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224158266.

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 20810690233 in words is "twenty billion, eight hundred ten million, six hundred ninety thousand, two hundred thirty-three".