20573648 has 10 divisors (see below), whose sum is σ = 39861474. Its totient is φ = 10286816.

The previous prime is 20573647. The next prime is 20573669. The reversal of 20573648 is 84637502.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19114384 + 1459264 = 4372^2 + 1208^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20573647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642911 + ... + 642942.

Almost surely, 2^20573648 is an apocalyptic number.

It is an amenable number.

20573648 is a deficient number, since it is larger than the sum of its proper divisors (19287826).

20573648 is a wasteful number, since it uses less digits than its factorization.

20573648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285861 (or 1285855 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 20573648 is about 4535.8183385140. The cubic root of 20573648 is about 274.0125378318.

The spelling of 20573648 in words is "twenty million, five hundred seventy-three thousand, six hundred forty-eight".