20043257 has 8 divisors (see below), whose sum is σ = 21678720. Its totient is φ = 18421200.

The previous prime is 20043253. The next prime is 20043259. The reversal of 20043257 is 75234002.

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 20043257 - 2² = 20043253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20043253) 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, 119 + ... + 6332.

It is an arithmetic number, because the mean of its divisors is an integer number (2709840).

Almost surely, 2^20043257 is an apocalyptic number.

It is an amenable number.

20043257 is a deficient number, since it is larger than the sum of its proper divisors (1635463).

20043257 is a wasteful number, since it uses less digits than its factorization.

20043257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6703.

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 20043257 is about 4476.9696224120. The cubic root of 20043257 is about 271.6373166799.

Adding to 20043257 its reverse (75234002), we get a palindrome (95277259).

The spelling of 20043257 in words is "twenty million, forty-three thousand, two hundred fifty-seven".