20485793 has 4 divisors (see below), whose sum is σ = 20499348. Its totient is φ = 20472240.

The previous prime is 20485789. The next prime is 20485807. The reversal of 20485793 is 39758402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5678689 + 14807104 = 2383^2 + 3848^2 .

It is a cyclic number.

It is not a de Polignac number, because 20485793 - 2² = 20485789 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20485733) 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 3 ways as a sum of consecutive naturals, for example, 4178 + ... + 7643.

It is an arithmetic number, because the mean of its divisors is an integer number (5124837).

Almost surely, 2^20485793 is an apocalyptic number.

It is an amenable number.

20485793 is a deficient number, since it is larger than the sum of its proper divisors (13555).

20485793 is a wasteful number, since it uses less digits than its factorization.

20485793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13554.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 20485793 is about 4526.1233964619. The cubic root of 20485793 is about 273.6219456266.

The spelling of 20485793 in words is "twenty million, four hundred eighty-five thousand, seven hundred ninety-three".