20648970 has 24 divisors (see below), whose sum is σ = 53687556. Its totient is φ = 5506368.

The previous prime is 20648951. The next prime is 20648977. The reversal of 20648970 is 7984602.

20648970 is a `hidden beast` number, since 2 + 0 + 648 + 9 + 7 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19158129 + 1490841 = 4377^2 + 1221^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20648977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114627 + ... + 114806.

Almost surely, 2^20648970 is an apocalyptic number.

20648970 is an abundant number, since it is smaller than the sum of its proper divisors (33038586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20648970 is a wasteful number, since it uses less digits than its factorization.

20648970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229446 (or 229443 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20648970 is about 4544.1137749841. The cubic root of 20648970 is about 274.3465255327.

The spelling of 20648970 in words is "twenty million, six hundred forty-eight thousand, nine hundred seventy".