20556764 has 12 divisors (see below), whose sum is σ = 36052800.
Its totient is φ = 10255968.
The previous prime is 20556743. The next prime is 20556769. The reversal of 20556764 is 46765502.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20556769) 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, 3449 + ... + 7280.
It is an arithmetic number, because the mean of its divisors is an integer number (3004400).
Almost surely, 220556764 is an apocalyptic number.
It is an amenable number.
20556764 is a deficient number, since it is larger than the sum of its proper divisors (15496036).
20556764 is a wasteful number, since it uses less digits than its factorization.
20556764 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 11212 (or 11210 counting only the distinct ones).
The product of its (nonzero) digits is 50400, while the sum is 35.
The square root of 20556764 is about 4533.9567708570.
The cubic root of 20556764 is about 273.9375601412.
The spelling of 20556764 in words is "twenty million, five hundred fifty-six thousand, seven hundred sixty-four".