20604497 has 4 divisors (see below), whose sum is σ = 20718516. Its totient is φ = 20490480.

The previous prime is 20604457. The next prime is 20604499. The reversal of 20604497 is 79440602.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1560001 + 19044496 = 1249^2 + 4364^2 .

It is a cyclic number.

It is not a de Polignac number, because 20604497 - 2⁶ = 20604433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20604499) 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, 56738 + ... + 57099.

It is an arithmetic number, because the mean of its divisors is an integer number (5179629).

Almost surely, 2^20604497 is an apocalyptic number.

It is an amenable number.

20604497 is a deficient number, since it is larger than the sum of its proper divisors (114019).

20604497 is a wasteful number, since it uses less digits than its factorization.

20604497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114018.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20604497 is about 4539.2176638712. The cubic root of 20604497 is about 274.1494247751.

The spelling of 20604497 in words is "twenty million, six hundred four thousand, four hundred ninety-seven".