20722566 has 8 divisors (see below), whose sum is σ = 41445144. Its totient is φ = 6907520.

The previous prime is 20722549. The next prime is 20722571. The reversal of 20722566 is 66522702.

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

20722566 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1726875 + ... + 1726886.

It is an arithmetic number, because the mean of its divisors is an integer number (5180643).

Almost surely, 2^20722566 is an apocalyptic number.

20722566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20722566 is a wasteful number, since it uses less digits than its factorization.

20722566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3453766.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 20722566 is about 4552.2045208888. The cubic root of 20722566 is about 274.6720763406.

The spelling of 20722566 in words is "twenty million, seven hundred twenty-two thousand, five hundred sixty-six".