20539887 has 8 divisors (see below), whose sum is σ = 28270080. Its totient is φ = 13251480.

The previous prime is 20539879. The next prime is 20539919. The reversal of 20539887 is 78893502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20539887 - 2³ = 20539879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20539807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110337 + ... + 110522.

It is an arithmetic number, because the mean of its divisors is an integer number (3533760).

Almost surely, 2^20539887 is an apocalyptic number.

20539887 is a deficient number, since it is larger than the sum of its proper divisors (7730193).

20539887 is a wasteful number, since it uses less digits than its factorization.

20539887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220893.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 20539887 is about 4532.0952108269. The cubic root of 20539887 is about 273.8625724956.

The spelling of 20539887 in words is "twenty million, five hundred thirty-nine thousand, eight hundred eighty-seven".