20513444541 has 4 divisors (see below), whose sum is σ = 27351259392. Its totient is φ = 13675629692.

The previous prime is 20513444537. The next prime is 20513444557. The reversal of 20513444541 is 14544431502.

It is a happy number.

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 cyclic number.

It is not a de Polignac number, because 20513444541 - 2² = 20513444537 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513444531) 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, 3418907421 + ... + 3418907426.

It is an arithmetic number, because the mean of its divisors is an integer number (6837814848).

Almost surely, 2^20513444541 is an apocalyptic number.

It is an amenable number.

20513444541 is a deficient number, since it is larger than the sum of its proper divisors (6837814851).

20513444541 is an equidigital number, since it uses as much as digits as its factorization.

20513444541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6837814850.

The product of its (nonzero) digits is 38400, while the sum is 33.

The spelling of 20513444541 in words is "twenty billion, five hundred thirteen million, four hundred forty-four thousand, five hundred forty-one".