20539061 has 4 divisors (see below), whose sum is σ = 20820492. Its totient is φ = 20257632.

The previous prime is 20539049. The next prime is 20539063. The reversal of 20539061 is 16093502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16093502 = 2 ⋅8046751.

It can be written as a sum of positive squares in 2 ways, for example, as 13830961 + 6708100 = 3719^2 + 2590^2 .

It is a cyclic number.

It is not a de Polignac number, because 20539061 - 2¹⁸ = 20276917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20539061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20539063) 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, 140606 + ... + 140751.

It is an arithmetic number, because the mean of its divisors is an integer number (5205123).

Almost surely, 2^20539061 is an apocalyptic number.

It is an amenable number.

20539061 is a deficient number, since it is larger than the sum of its proper divisors (281431).

20539061 is an equidigital number, since it uses as much as digits as its factorization.

20539061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281430.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 20539061 is about 4532.0040820811. The cubic root of 20539061 is about 273.8589013700.

The spelling of 20539061 in words is "twenty million, five hundred thirty-nine thousand, sixty-one".