20205823 has 8 divisors (see below), whose sum is σ = 22404816. Its totient is φ = 18067200.

The previous prime is 20205821. The next prime is 20205847. The reversal of 20205823 is 32850202.

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 20205823 - 2¹ = 20205821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20205794 and 20205803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205821) 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, 14386 + ... + 15727.

It is an arithmetic number, because the mean of its divisors is an integer number (2800602).

Almost surely, 2^20205823 is an apocalyptic number.

20205823 is a deficient number, since it is larger than the sum of its proper divisors (2198993).

20205823 is a wasteful number, since it uses less digits than its factorization.

20205823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30185.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20205823 is about 4495.0887644183. The cubic root of 20205823 is about 272.3697348935.

The spelling of 20205823 in words is "twenty million, two hundred five thousand, eight hundred twenty-three".