20390541 has 4 divisors (see below), whose sum is σ = 27187392. Its totient is φ = 13593692.

The previous prime is 20390483. The next prime is 20390549. The reversal of 20390541 is 14509302.

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 20390541 - 2⁷ = 20390413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20390549) 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, 3398421 + ... + 3398426.

It is an arithmetic number, because the mean of its divisors is an integer number (6796848).

Almost surely, 2^20390541 is an apocalyptic number.

It is an amenable number.

20390541 is a deficient number, since it is larger than the sum of its proper divisors (6796851).

20390541 is an equidigital number, since it uses as much as digits as its factorization.

20390541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6796850.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20390541 is about 4515.5886659438. The cubic root of 20390541 is about 273.1972035139.

Adding to 20390541 its reverse (14509302), we get a palindrome (34899843).

The spelling of 20390541 in words is "twenty million, three hundred ninety thousand, five hundred forty-one".