20023557 has 8 divisors (see below), whose sum is σ = 26837184. Its totient is φ = 13279488.

The previous prime is 20023537. The next prime is 20023561. The reversal of 20023557 is 75532002.

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

It is not a de Polignac number, because 20023557 - 2⁷ = 20023429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023537) 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, 16713 + ... + 17870.

It is an arithmetic number, because the mean of its divisors is an integer number (3354648).

Almost surely, 2^20023557 is an apocalyptic number.

It is an amenable number.

20023557 is a deficient number, since it is larger than the sum of its proper divisors (6813627).

20023557 is a wasteful number, since it uses less digits than its factorization.

20023557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34779.

The product of its (nonzero) digits is 2100, while the sum is 24.

The square root of 20023557 is about 4474.7689325819. The cubic root of 20023557 is about 271.5482924043.

Adding to 20023557 its reverse (75532002), we get a palindrome (95555559).

The spelling of 20023557 in words is "twenty million, twenty-three thousand, five hundred fifty-seven".