20025437 has 4 divisors (see below), whose sum is σ = 20036700. Its totient is φ = 20014176.

The previous prime is 20025419. The next prime is 20025443. The reversal of 20025437 is 73452002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 18757561 + 1267876 = 4331^2 + 1126^2 .

It is a cyclic number.

It is not a de Polignac number, because 20025437 - 2¹² = 20021341 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 (20025497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2312 + ... + 6737.

It is an arithmetic number, because the mean of its divisors is an integer number (5009175).

Almost surely, 2^20025437 is an apocalyptic number.

It is an amenable number.

20025437 is a deficient number, since it is larger than the sum of its proper divisors (11263).

20025437 is an equidigital number, since it uses as much as digits as its factorization.

20025437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11262.

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

The square root of 20025437 is about 4474.9789943641. The cubic root of 20025437 is about 271.5567906416.

Adding to 20025437 its reverse (73452002), we get a palindrome (93477439).

The spelling of 20025437 in words is "twenty million, twenty-five thousand, four hundred thirty-seven".