20655793 has 4 divisors (see below), whose sum is σ = 21742960. Its totient is φ = 19568628.

The previous prime is 20655773. The next prime is 20655829. The reversal of 20655793 is 39755602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39755602 = 2 ⋅19877801.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20655793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20655763) 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, 543555 + ... + 543592.

It is an arithmetic number, because the mean of its divisors is an integer number (5435740).

Almost surely, 2^20655793 is an apocalyptic number.

It is an amenable number.

20655793 is a deficient number, since it is larger than the sum of its proper divisors (1087167).

20655793 is a wasteful number, since it uses less digits than its factorization.

20655793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087166.

The product of its (nonzero) digits is 56700, while the sum is 37.

The square root of 20655793 is about 4544.8644644258. The cubic root of 20655793 is about 274.3767394725.

The spelling of 20655793 in words is "twenty million, six hundred fifty-five thousand, seven hundred ninety-three".