20662649 has 8 divisors (see below), whose sum is σ = 23858688. Its totient is φ = 17527680.

The previous prime is 20662643. The next prime is 20662693. The reversal of 20662649 is 94626602.

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 20662649 - 2⁸ = 20662393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20662643) 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, 14537 + ... + 15894.

It is an arithmetic number, because the mean of its divisors is an integer number (2982336).

Almost surely, 2^20662649 is an apocalyptic number.

It is an amenable number.

20662649 is a deficient number, since it is larger than the sum of its proper divisors (3196039).

20662649 is an equidigital number, since it uses as much as digits as its factorization.

20662649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30535.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 20662649 is about 4545.6186597646. The cubic root of 20662649 is about 274.4070928434.

The spelling of 20662649 in words is "twenty million, six hundred sixty-two thousand, six hundred forty-nine".