20489722566 has 24 divisors (see below), whose sum is σ = 43531801800. Its totient is φ = 6428147712.

The previous prime is 20489722543. The next prime is 20489722573. The reversal of 20489722566 is 66522798402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5906491 + ... + 5909958.

It is an arithmetic number, because the mean of its divisors is an integer number (1813825075).

Almost surely, 2^20489722566 is an apocalyptic number.

20489722566 is an abundant number, since it is smaller than the sum of its proper divisors (23042079234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20489722566 is a wasteful number, since it uses less digits than its factorization.

20489722566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11816488 (or 11816471 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 51.

The spelling of 20489722566 in words is "twenty billion, four hundred eighty-nine million, seven hundred twenty-two thousand, five hundred sixty-six".