20072257 has 4 divisors (see below), whose sum is σ = 21252996. Its totient is φ = 18891520.

The previous prime is 20072209. The next prime is 20072267. The reversal of 20072257 is 75227002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75227002 = 2 ⋅37613501.

It can be written as a sum of positive squares in 2 ways, for example, as 16008001 + 4064256 = 4001^2 + 2016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20072257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20072207) 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, 590344 + ... + 590377.

It is an arithmetic number, because the mean of its divisors is an integer number (5313249).

Almost surely, 2^20072257 is an apocalyptic number.

It is an amenable number.

20072257 is a deficient number, since it is larger than the sum of its proper divisors (1180739).

20072257 is a wasteful number, since it uses less digits than its factorization.

20072257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180738.

The product of its (nonzero) digits is 1960, while the sum is 25.

The square root of 20072257 is about 4480.2072496705. The cubic root of 20072257 is about 271.7682615657.

Adding to 20072257 its reverse (75227002), we get a palindrome (95299259).

The spelling of 20072257 in words is "twenty million, seventy-two thousand, two hundred fifty-seven".