20556790 has 8 divisors (see below), whose sum is σ = 37002240. Its totient is φ = 8222712.

The previous prime is 20556787. The next prime is 20556797. The reversal of 20556790 is 9765502.

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 (20556797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1027830 + ... + 1027849.

It is an arithmetic number, because the mean of its divisors is an integer number (4625280).

Almost surely, 2^20556790 is an apocalyptic number.

20556790 is a deficient number, since it is larger than the sum of its proper divisors (16445450).

20556790 is a wasteful number, since it uses less digits than its factorization.

20556790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2055686.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 20556790 is about 4533.9596381088. The cubic root of 20556790 is about 273.9376756324.

The spelling of 20556790 in words is "twenty million, five hundred fifty-six thousand, seven hundred ninety".