20553799 has 8 divisors (see below), whose sum is σ = 24871968. Its totient is φ = 16581120.

The previous prime is 20553787. The next prime is 20553823. The reversal of 20553799 is 99735502.

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

It is not a de Polignac number, because 20553799 - 2⁹ = 20553287 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 (20553739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86242 + ... + 86479.

It is an arithmetic number, because the mean of its divisors is an integer number (3108996).

Almost surely, 2^20553799 is an apocalyptic number.

20553799 is a deficient number, since it is larger than the sum of its proper divisors (4318169).

20553799 is a wasteful number, since it uses less digits than its factorization.

20553799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172745.

The product of its (nonzero) digits is 85050, while the sum is 40.

The square root of 20553799 is about 4533.6297819738. The cubic root of 20553799 is about 273.9243890682.

Adding to 20553799 its product of nonzero digits (85050), we get a square (20638849 = 4543²).

The spelling of 20553799 in words is "twenty million, five hundred fifty-three thousand, seven hundred ninety-nine".