20625443 has 4 divisors (see below), whose sum is σ = 20635368. Its totient is φ = 20615520.

The previous prime is 20625439. The next prime is 20625491. The reversal of 20625443 is 34452602.

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, and also an emirpimes, since its reverse is a distinct semiprime: 34452602 = 2 ⋅17226301.

It is a cyclic number.

It is not a de Polignac number, because 20625443 - 2² = 20625439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20625413) 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, 518 + ... + 6443.

It is an arithmetic number, because the mean of its divisors is an integer number (5158842).

Almost surely, 2^20625443 is an apocalyptic number.

20625443 is a deficient number, since it is larger than the sum of its proper divisors (9925).

20625443 is an equidigital number, since it uses as much as digits as its factorization.

20625443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9924.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 20625443 is about 4541.5243035791. The cubic root of 20625443 is about 274.2422910575.

The spelling of 20625443 in words is "twenty million, six hundred twenty-five thousand, four hundred forty-three".