20433513913 has 4 divisors (see below), whose sum is σ = 20468927860. Its totient is φ = 20398099968.

The previous prime is 20433513899. The next prime is 20433513923. The reversal of 20433513913 is 31931533402.

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 11170798864 + 9262715049 = 105692^2 + 96243^2 .

It is a cyclic number.

It is not a de Polignac number, because 20433513913 - 2¹³ = 20433505721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20433513923) 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, 17706108 + ... + 17707261.

It is an arithmetic number, because the mean of its divisors is an integer number (5117231965).

Almost surely, 2^20433513913 is an apocalyptic number.

It is an amenable number.

20433513913 is a deficient number, since it is larger than the sum of its proper divisors (35413947).

20433513913 is an equidigital number, since it uses as much as digits as its factorization.

20433513913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35413946.

The product of its (nonzero) digits is 29160, while the sum is 34.

The spelling of 20433513913 in words is "twenty billion, four hundred thirty-three million, five hundred thirteen thousand, nine hundred thirteen".