20549993 has 8 divisors (see below), whose sum is σ = 21267456. Its totient is φ = 19836000.

The previous prime is 20549989. The next prime is 20549999. The reversal of 20549993 is 39994502.

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

It is a cyclic number.

It is not a de Polignac number, because 20549993 - 2² = 20549989 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 20549993.

It is not an unprimeable number, because it can be changed into a prime (20549999) 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, 18080 + ... + 19182.

It is an arithmetic number, because the mean of its divisors is an integer number (2658432).

Almost surely, 2^20549993 is an apocalyptic number.

It is an amenable number.

20549993 is a deficient number, since it is larger than the sum of its proper divisors (717463).

20549993 is a wasteful number, since it uses less digits than its factorization.

20549993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 20549993 is about 4533.2100105775. The cubic root of 20549993 is about 273.9074802625.

The spelling of 20549993 in words is "twenty million, five hundred forty-nine thousand, nine hundred ninety-three".