20499541 has 4 divisors (see below), whose sum is σ = 20515500. Its totient is φ = 20483584.

The previous prime is 20499539. The next prime is 20499551. The reversal of 20499541 is 14599402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7177041 + 13322500 = 2679^2 + 3650^2 .

It is a cyclic number.

It is not a de Polignac number, because 20499541 - 2¹ = 20499539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20499497 and 20499506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20499511) 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, 5866 + ... + 8683.

It is an arithmetic number, because the mean of its divisors is an integer number (5128875).

Almost surely, 2^20499541 is an apocalyptic number.

It is an amenable number.

20499541 is a deficient number, since it is larger than the sum of its proper divisors (15959).

20499541 is a wasteful number, since it uses less digits than its factorization.

20499541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15958.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20499541 is about 4527.6418807145. The cubic root of 20499541 is about 273.6831410987.

The spelling of 20499541 in words is "twenty million, four hundred ninety-nine thousand, five hundred forty-one".