20227257 has 6 divisors (see below), whose sum is σ = 29217162. Its totient is φ = 13484832.

The previous prime is 20227247. The next prime is 20227279. The reversal of 20227257 is 75272202.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18844281 + 1382976 = 4341^2 + 1176^2 .

It is not a de Polignac number, because 20227257 - 2⁴ = 20227241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20227257.

It is not an unprimeable number, because it can be changed into a prime (20227217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1123728 + ... + 1123745.

It is an arithmetic number, because the mean of its divisors is an integer number (4869527).

Almost surely, 2^20227257 is an apocalyptic number.

It is an amenable number.

20227257 is a deficient number, since it is larger than the sum of its proper divisors (8989905).

20227257 is a wasteful number, since it uses less digits than its factorization.

20227257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2247479 (or 2247476 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 27.

The square root of 20227257 is about 4497.4722900758. The cubic root of 20227257 is about 272.4660092833.

Adding to 20227257 its reverse (75272202), we get a palindrome (95499459).

The spelling of 20227257 in words is "twenty million, two hundred twenty-seven thousand, two hundred fifty-seven".