20649028 has 12 divisors (see below), whose sum is σ = 36487360. Its totient is φ = 10224072.

The previous prime is 20649019. The next prime is 20649037. The reversal of 20649028 is 82094602.

It is an interprime number because it is at equal distance from previous prime (20649019) and next prime (20649037).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24648 + ... + 25471.

Almost surely, 2^20649028 is an apocalyptic number.

It is an amenable number.

20649028 is a deficient number, since it is larger than the sum of its proper divisors (15838332).

20649028 is a wasteful number, since it uses less digits than its factorization.

20649028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50226 (or 50224 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20649028 is about 4544.1201568621. The cubic root of 20649028 is about 274.3467823991.

The spelling of 20649028 in words is "twenty million, six hundred forty-nine thousand, twenty-eight".