20646056 has 8 divisors (see below), whose sum is σ = 38711370. Its totient is φ = 10323024.

The previous prime is 20646053. The next prime is 20646061. The reversal of 20646056 is 65064602.

It can be written as a sum of positive squares in only one way, i.e., 10824100 + 9821956 = 3290^2 + 3134^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20646053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1290371 + ... + 1290386.

Almost surely, 2^20646056 is an apocalyptic number.

It is an amenable number.

20646056 is a deficient number, since it is larger than the sum of its proper divisors (18065314).

20646056 is a wasteful number, since it uses less digits than its factorization.

20646056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2580763 (or 2580759 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 20646056 is about 4543.7931290938. The cubic root of 20646056 is about 274.3336195881. Note that the first 3 decimals are identical.

The spelling of 20646056 in words is "twenty million, six hundred forty-six thousand, fifty-six".