20223557 has 4 divisors (see below), whose sum is σ = 21413196. Its totient is φ = 19033920.

The previous prime is 20223551. The next prime is 20223611. The reversal of 20223557 is 75532202.

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 18671041 + 1552516 = 4321^2 + 1246^2 .

It is a cyclic number.

It is not a de Polignac number, because 20223557 - 2¹⁸ = 19961413 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 (20223551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 594794 + ... + 594827.

It is an arithmetic number, because the mean of its divisors is an integer number (5353299).

Almost surely, 2^20223557 is an apocalyptic number.

It is an amenable number.

20223557 is a deficient number, since it is larger than the sum of its proper divisors (1189639).

20223557 is a wasteful number, since it uses less digits than its factorization.

20223557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189638.

The product of its (nonzero) digits is 4200, while the sum is 26.

The square root of 20223557 is about 4497.0609290958. The cubic root of 20223557 is about 272.4493949740.

Adding to 20223557 its reverse (75532202), we get a palindrome (95755759).

The spelling of 20223557 in words is "twenty million, two hundred twenty-three thousand, five hundred fifty-seven".