20649204 has 36 divisors (see below), whose sum is σ = 52501540. Its totient is φ = 6842880.

The previous prime is 20649191. The next prime is 20649217. The reversal of 20649204 is 40294602.

It is an interprime number because it is at equal distance from previous prime (20649191) and next prime (20649217).

It can be written as a sum of positive squares in 2 ways, for example, as 7033104 + 13616100 = 2652^2 + 3690^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4932 + ... + 8100.

Almost surely, 2^20649204 is an apocalyptic number.

It is an amenable number.

20649204 is an abundant number, since it is smaller than the sum of its proper divisors (31852336).

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

20649204 is a wasteful number, since it uses less digits than its factorization.

20649204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3360 (or 3355 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20649204 is about 4544.1395225059. The cubic root of 20649204 is about 274.3475618530.

The spelling of 20649204 in words is "twenty million, six hundred forty-nine thousand, two hundred four".