20504692531 has 4 divisors (see below), whose sum is σ = 20515087152. Its totient is φ = 20494297912.

The previous prime is 20504692493. The next prime is 20504692541. The reversal of 20504692531 is 13529640502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20504692531 - 2¹³ = 20504684339 is a prime.

It is a super-2 number, since 2×20504692531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20504692541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5194351 + ... + 5198296.

It is an arithmetic number, because the mean of its divisors is an integer number (5128771788).

Almost surely, 2^20504692531 is an apocalyptic number.

20504692531 is a deficient number, since it is larger than the sum of its proper divisors (10394621).

20504692531 is a wasteful number, since it uses less digits than its factorization.

20504692531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10394620.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 20504692531 in words is "twenty billion, five hundred four million, six hundred ninety-two thousand, five hundred thirty-one".