20549047 has 4 divisors (see below), whose sum is σ = 20567880. Its totient is φ = 20530216.

The previous prime is 20549027. The next prime is 20549069. The reversal of 20549047 is 74094502.

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 20549047 - 2⁷ = 20548919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20549027) 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, 7672 + ... + 9997.

It is an arithmetic number, because the mean of its divisors is an integer number (5141970).

Almost surely, 2^20549047 is an apocalyptic number.

20549047 is a deficient number, since it is larger than the sum of its proper divisors (18833).

20549047 is a wasteful number, since it uses less digits than its factorization.

20549047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18832.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20549047 is about 4533.1056683029. The cubic root of 20549047 is about 273.9032771718.

The spelling of 20549047 in words is "twenty million, five hundred forty-nine thousand, forty-seven".