20649513 has 8 divisors (see below), whose sum is σ = 27842400. Its totient is φ = 13611488.

The previous prime is 20649493. The next prime is 20649529. The reversal of 20649513 is 31594602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20649513 - 2⁵ = 20649481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20649593) 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, 38403 + ... + 38936.

It is an arithmetic number, because the mean of its divisors is an integer number (3480300).

Almost surely, 2^20649513 is an apocalyptic number.

It is an amenable number.

20649513 is a deficient number, since it is larger than the sum of its proper divisors (7192887).

20649513 is an equidigital number, since it uses as much as digits as its factorization.

20649513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77431.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 20649513 is about 4544.1735222150. The cubic root of 20649513 is about 274.3489303154.

The spelling of 20649513 in words is "twenty million, six hundred forty-nine thousand, five hundred thirteen".