20916832231 has 4 divisors (see below), whose sum is σ = 20918835000. Its totient is φ = 20914829464.

The previous prime is 20916832219. The next prime is 20916832369. The reversal of 20916832231 is 13223861902.

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 20916832231 - 2¹³ = 20916824039 is a prime.

It is a super-2 number, since 2×20916832231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20916832031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 985636 + ... + 1006633.

It is an arithmetic number, because the mean of its divisors is an integer number (5229708750).

Almost surely, 2^20916832231 is an apocalyptic number.

20916832231 is a deficient number, since it is larger than the sum of its proper divisors (2002769).

20916832231 is a wasteful number, since it uses less digits than its factorization.

20916832231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002768.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 20916832231 in words is "twenty billion, nine hundred sixteen million, eight hundred thirty-two thousand, two hundred thirty-one".