20931407686 has 8 divisors (see below), whose sum is σ = 35882413200. Its totient is φ = 8970603288.

The previous prime is 20931407671. The next prime is 20931407687. The reversal of 20931407686 is 68670413902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20931407687) 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, 747550261 + ... + 747550288.

It is an arithmetic number, because the mean of its divisors is an integer number (4485301650).

Almost surely, 2^20931407686 is an apocalyptic number.

20931407686 is a deficient number, since it is larger than the sum of its proper divisors (14951005514).

20931407686 is a wasteful number, since it uses less digits than its factorization.

20931407686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495100558.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 20931407686 in words is "twenty billion, nine hundred thirty-one million, four hundred seven thousand, six hundred eighty-six".