20604263 has 4 divisors (see below), whose sum is σ = 21106848. Its totient is φ = 20101680.

The previous prime is 20604247. The next prime is 20604277. The reversal of 20604263 is 36240602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20604263 - 2⁴ = 20604247 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 (20604203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251231 + ... + 251312.

It is an arithmetic number, because the mean of its divisors is an integer number (5276712).

Almost surely, 2^20604263 is an apocalyptic number.

20604263 is a deficient number, since it is larger than the sum of its proper divisors (502585).

20604263 is an equidigital number, since it uses as much as digits as its factorization.

20604263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502584.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 20604263 is about 4539.1918884312. The cubic root of 20604263 is about 274.1483869562.

Adding to 20604263 its reverse (36240602), we get a palindrome (56844865).

The spelling of 20604263 in words is "twenty million, six hundred four thousand, two hundred sixty-three".