20204497 has 4 divisors (see below), whose sum is σ = 20321460. Its totient is φ = 20087536.

The previous prime is 20204477. The next prime is 20204519. The reversal of 20204497 is 79440202.

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 7750656 + 12453841 = 2784^2 + 3529^2 .

It is a cyclic number.

It is not a de Polignac number, because 20204497 - 2⁷ = 20204369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20204417) 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, 58222 + ... + 58567.

It is an arithmetic number, because the mean of its divisors is an integer number (5080365).

Almost surely, 2^20204497 is an apocalyptic number.

It is an amenable number.

20204497 is a deficient number, since it is larger than the sum of its proper divisors (116963).

20204497 is a wasteful number, since it uses less digits than its factorization.

20204497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116962.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20204497 is about 4494.9412676919. The cubic root of 20204497 is about 272.3637767073.

Adding to 20204497 its reverse (79440202), we get a palindrome (99644699).

The spelling of 20204497 in words is "twenty million, two hundred four thousand, four hundred ninety-seven".