20502823 has 4 divisors (see below), whose sum is σ = 22366728. Its totient is φ = 18638920.

The previous prime is 20502817. The next prime is 20502827. The reversal of 20502823 is 32820502.

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

It is a cyclic number.

It is not a de Polignac number, because 20502823 - 2¹⁷ = 20371751 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20502794 and 20502803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20502827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 931936 + ... + 931957.

It is an arithmetic number, because the mean of its divisors is an integer number (5591682).

Almost surely, 2^20502823 is an apocalyptic number.

20502823 is a deficient number, since it is larger than the sum of its proper divisors (1863905).

20502823 is a wasteful number, since it uses less digits than its factorization.

20502823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1863904.

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

The square root of 20502823 is about 4528.0043065351. The cubic root of 20502823 is about 273.6977459808.

The spelling of 20502823 in words is "twenty million, five hundred two thousand, eight hundred twenty-three".