20575823 has 8 divisors (see below), whose sum is σ = 21516288. Its totient is φ = 19639224.

The previous prime is 20575817. The next prime is 20575843. The reversal of 20575823 is 32857502.

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 20575823 - 2⁶ = 20575759 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20575823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20575843) 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, 18386 + ... + 19472.

It is an arithmetic number, because the mean of its divisors is an integer number (2689536).

Almost surely, 2^20575823 is an apocalyptic number.

20575823 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20575823 is a deficient number, since it is larger than the sum of its proper divisors (940465).

20575823 is a wasteful number, since it uses less digits than its factorization.

20575823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1933.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 20575823 is about 4536.0580904570. The cubic root of 20575823 is about 274.0221934889.

It can be divided in two parts, 20575 and 823, that multiplied together give a square (16933225 = 4115²).

The spelling of 20575823 in words is "twenty million, five hundred seventy-five thousand, eight hundred twenty-three".