20539761567 has 16 divisors (see below), whose sum is σ = 30290100960. Its totient is φ = 12298234752.

The previous prime is 20539761551. The next prime is 20539761569. The reversal of 20539761567 is 76516793502.

It is not a de Polignac number, because 20539761567 - 2⁴ = 20539761551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20539761569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7115592 + ... + 7118477.

It is an arithmetic number, because the mean of its divisors is an integer number (1893131310).

Almost surely, 2^20539761567 is an apocalyptic number.

20539761567 is a deficient number, since it is larger than the sum of its proper divisors (9750339393).

20539761567 is a wasteful number, since it uses less digits than its factorization.

20539761567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14234122.

The product of its (nonzero) digits is 2381400, while the sum is 51.

The spelling of 20539761567 in words is "twenty billion, five hundred thirty-nine million, seven hundred sixty-one thousand, five hundred sixty-seven".