20553766 has 12 divisors (see below), whose sum is σ = 32231052. Its totient is φ = 9829556.

The previous prime is 20553739. The next prime is 20553773. The reversal of 20553766 is 66735502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8656 + ... + 10771.

It is an arithmetic number, because the mean of its divisors is an integer number (2685921).

Almost surely, 2^20553766 is an apocalyptic number.

20553766 is a deficient number, since it is larger than the sum of its proper divisors (11677286).

20553766 is a wasteful number, since it uses less digits than its factorization.

20553766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19475 (or 19452 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 34.

The square root of 20553766 is about 4533.6261425045. The cubic root of 20553766 is about 273.9242424690.

The spelling of 20553766 in words is "twenty million, five hundred fifty-three thousand, seven hundred sixty-six".