20566620 has 36 divisors (see below), whose sum is σ = 62385960. Its totient is φ = 5484384.

The previous prime is 20566613. The next prime is 20566631. The reversal of 20566620 is 2666502.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56950 + ... + 57309.

Almost surely, 2^20566620 is an apocalyptic number.

20566620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20566620 is an abundant number, since it is smaller than the sum of its proper divisors (41819340).

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

20566620 is a wasteful number, since it uses less digits than its factorization.

20566620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114274 (or 114269 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20566620 is about 4535.0435499563. The cubic root of 20566620 is about 273.9813331983.

The spelling of 20566620 in words is "twenty million, five hundred sixty-six thousand, six hundred twenty".