20613648 has 40 divisors (see below), whose sum is σ = 58094496. Its totient is φ = 6246400.

The previous prime is 20613647. The next prime is 20613731. The reversal of 20613648 is 84631602.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20613647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18993 + ... + 20048.

Almost surely, 2^20613648 is an apocalyptic number.

It is an amenable number.

20613648 is an abundant number, since it is smaller than the sum of its proper divisors (37480848).

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

20613648 is a wasteful number, since it uses less digits than its factorization.

20613648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39063 (or 39057 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 20613648 is about 4540.2255450583. The cubic root of 20613648 is about 274.1900044291.

The spelling of 20613648 in words is "twenty million, six hundred thirteen thousand, six hundred forty-eight".