20531735839 has 12 divisors (see below), whose sum is σ = 22514987664. Its totient is φ = 18657629312.

The previous prime is 20531735789. The next prime is 20531735893. The reversal of 20531735839 is 93853713502.

It is not a de Polignac number, because 20531735839 - 2¹³ = 20531727647 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 (20531735899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 703747 + ... + 732340.

It is an arithmetic number, because the mean of its divisors is an integer number (1876248972).

Almost surely, 2^20531735839 is an apocalyptic number.

20531735839 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20531735839 is a deficient number, since it is larger than the sum of its proper divisors (1983251825).

20531735839 is a wasteful number, since it uses less digits than its factorization.

20531735839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436162 (or 1436133 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 46.

The spelling of 20531735839 in words is "twenty billion, five hundred thirty-one million, seven hundred thirty-five thousand, eight hundred thirty-nine".