20225287 has 2 divisors, whose sum is σ = 20225288. Its totient is φ = 20225286.

The previous prime is 20225281. The next prime is 20225297. The reversal of 20225287 is 78252202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20225287 - 2⁷ = 20225159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20225281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10112643 + 10112644.

It is an arithmetic number, because the mean of its divisors is an integer number (10112644).

Almost surely, 2^20225287 is an apocalyptic number.

20225287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20225287 is an equidigital number, since it uses as much as digits as its factorization.

20225287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 20225287 is about 4497.2532728322. The cubic root of 20225287 is about 272.4571635384.

Adding to 20225287 its reverse (78252202), we get a palindrome (98477489).

The spelling of 20225287 in words is "twenty million, two hundred twenty-five thousand, two hundred eighty-seven".