20204557 has 8 divisors (see below), whose sum is σ = 21252096. Its totient is φ = 19171152.

The previous prime is 20204533. The next prime is 20204563. The reversal of 20204557 is 75540202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20204557 - 2¹¹ = 20202509 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 (20204357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 538 + ... + 6379.

It is an arithmetic number, because the mean of its divisors is an integer number (2656512).

Almost surely, 2^20204557 is an apocalyptic number.

It is an amenable number.

20204557 is a deficient number, since it is larger than the sum of its proper divisors (1047539).

20204557 is a wasteful number, since it uses less digits than its factorization.

20204557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7067.

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 20204557 is about 4494.9479418565. The cubic root of 20204557 is about 272.3640463141.

Adding to 20204557 its reverse (75540202), we get a palindrome (95744759).

The spelling of 20204557 in words is "twenty million, two hundred four thousand, five hundred fifty-seven".