20078539 has 4 divisors (see below), whose sum is σ = 21623056. Its totient is φ = 18534024.

The previous prime is 20078533. The next prime is 20078551. The reversal of 20078539 is 93587002.

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

It is a cyclic number.

It is not a de Polignac number, because 20078539 - 2⁵ = 20078507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20078533) 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, 772239 + ... + 772264.

It is an arithmetic number, because the mean of its divisors is an integer number (5405764).

Almost surely, 2^20078539 is an apocalyptic number.

20078539 is a deficient number, since it is larger than the sum of its proper divisors (1544517).

20078539 is a wasteful number, since it uses less digits than its factorization.

20078539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544516.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 20078539 is about 4480.9082784632. The cubic root of 20078539 is about 271.7966103150.

The spelling of 20078539 in words is "twenty million, seventy-eight thousand, five hundred thirty-nine".