20338557 has 4 divisors (see below), whose sum is σ = 27118080. Its totient is φ = 13559036.

The previous prime is 20338529. The next prime is 20338561. The reversal of 20338557 is 75583302.

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 20338557 - 2⁸ = 20338301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20338057) 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, 3389757 + ... + 3389762.

It is an arithmetic number, because the mean of its divisors is an integer number (6779520).

Almost surely, 2^20338557 is an apocalyptic number.

It is an amenable number.

20338557 is a deficient number, since it is larger than the sum of its proper divisors (6779523).

20338557 is an equidigital number, since it uses as much as digits as its factorization.

20338557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6779522.

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 20338557 is about 4509.8289324541. The cubic root of 20338557 is about 272.9648413712.

The spelling of 20338557 in words is "twenty million, three hundred thirty-eight thousand, five hundred fifty-seven".