20533504413 has 4 divisors (see below), whose sum is σ = 27378005888. Its totient is φ = 13689002940.

The previous prime is 20533504391. The next prime is 20533504429. The reversal of 20533504413 is 31440533502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-20533504413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20533504483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3422250733 + ... + 3422250738.

It is an arithmetic number, because the mean of its divisors is an integer number (6844501472).

Almost surely, 2^20533504413 is an apocalyptic number.

It is an amenable number.

20533504413 is a deficient number, since it is larger than the sum of its proper divisors (6844501475).

20533504413 is an equidigital number, since it uses as much as digits as its factorization.

20533504413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6844501474.

The product of its (nonzero) digits is 21600, while the sum is 30.

The spelling of 20533504413 in words is "twenty billion, five hundred thirty-three million, five hundred four thousand, four hundred thirteen".