20225437 has 4 divisors (see below), whose sum is σ = 20695840. Its totient is φ = 19755036.

The previous prime is 20225419. The next prime is 20225477. The reversal of 20225437 is 73452202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20225437 - 2¹¹ = 20223389 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 (20225477) 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, 235137 + ... + 235222.

It is an arithmetic number, because the mean of its divisors is an integer number (5173960).

Almost surely, 2^20225437 is an apocalyptic number.

20225437 is the 2597-th hex number.

It is an amenable number.

20225437 is a deficient number, since it is larger than the sum of its proper divisors (470403).

20225437 is an equidigital number, since it uses as much as digits as its factorization.

20225437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470402.

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 20225437 is about 4497.2699496472. The cubic root of 20225437 is about 272.4578370925.

Adding to 20225437 its reverse (73452202), we get a palindrome (93677639).

The spelling of 20225437 in words is "twenty million, two hundred twenty-five thousand, four hundred thirty-seven".