20604949 has 4 divisors (see below), whose sum is σ = 21689440. Its totient is φ = 19520460.

The previous prime is 20604931. The next prime is 20604959. The reversal of 20604949 is 94940602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20604949 - 2⁵ = 20604917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20604959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542217 + ... + 542254.

It is an arithmetic number, because the mean of its divisors is an integer number (5422360).

Almost surely, 2^20604949 is an apocalyptic number.

It is an amenable number.

20604949 is a deficient number, since it is larger than the sum of its proper divisors (1084491).

20604949 is a wasteful number, since it uses less digits than its factorization.

20604949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084490.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 20604949 is about 4539.2674519134. The cubic root of 20604949 is about 274.1514294286.

The spelling of 20604949 in words is "twenty million, six hundred four thousand, nine hundred forty-nine".