19880539 has 4 divisors (see below), whose sum is σ = 22720624. Its totient is φ = 17040456.

The previous prime is 19880521. The next prime is 19880551. The reversal of 19880539 is 93508891.

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 19880539 - 2¹⁷ = 19749467 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19880495 and 19880504.

It is not an unprimeable number, because it can be changed into a prime (19880519) 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, 1420032 + ... + 1420045.

It is an arithmetic number, because the mean of its divisors is an integer number (5680156).

Almost surely, 2^19880539 is an apocalyptic number.

19880539 is a deficient number, since it is larger than the sum of its proper divisors (2840085).

19880539 is an equidigital number, since it uses as much as digits as its factorization.

19880539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2840084.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 19880539 is about 4458.7598051476. The cubic root of 19880539 is about 270.9002369679.

The spelling of 19880539 in words is "nineteen million, eight hundred eighty thousand, five hundred thirty-nine".