20311065433 has 4 divisors (see below), whose sum is σ = 20416304308. Its totient is φ = 20205826560.

The previous prime is 20311065409. The next prime is 20311065449. The reversal of 20311065433 is 33456011302.

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 2432166489 + 17878898944 = 49317^2 + 133712^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20311065433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20311065403) 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, 52619148 + ... + 52619533.

It is an arithmetic number, because the mean of its divisors is an integer number (5104076077).

Almost surely, 2^20311065433 is an apocalyptic number.

It is an amenable number.

20311065433 is a deficient number, since it is larger than the sum of its proper divisors (105238875).

20311065433 is a wasteful number, since it uses less digits than its factorization.

20311065433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105238874.

The product of its (nonzero) digits is 6480, while the sum is 28.

Adding to 20311065433 its reverse (33456011302), we get a palindrome (53767076735).

The spelling of 20311065433 in words is "twenty billion, three hundred eleven million, sixty-five thousand, four hundred thirty-three".