20989634883 has 32 divisors (see below), whose sum is σ = 33384960000. Its totient is φ = 11469111456.

The previous prime is 20989634779. The next prime is 20989634927. The reversal of 20989634883 is 38843698902.

It is a Cunningham number, because it is equal to 144878²-1.

It is not a de Polignac number, because 20989634883 - 2¹² = 20989630787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20989632883) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3038968 + ... + 3045866.

It is an arithmetic number, because the mean of its divisors is an integer number (1043280000).

Almost surely, 2^20989634883 is an apocalyptic number.

20989634883 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20989634883 is a deficient number, since it is larger than the sum of its proper divisors (12395325117).

20989634883 is a wasteful number, since it uses less digits than its factorization.

20989634883 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13231.

The product of its (nonzero) digits is 17915904, while the sum is 60.

The spelling of 20989634883 in words is "twenty billion, nine hundred eighty-nine million, six hundred thirty-four thousand, eight hundred eighty-three".