20354823 has 12 divisors (see below), whose sum is σ = 29900520. Its totient is φ = 13339536.

The previous prime is 20354821. The next prime is 20354827. The reversal of 20354823 is 32845302.

It is not a de Polignac number, because 20354823 - 2¹ = 20354821 is a prime.

It is a super-2 number, since 2×20354823² = 828637638722658, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20354821) 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 11 ways as a sum of consecutive naturals, for example, 18636 + ... + 19697.

It is an arithmetic number, because the mean of its divisors is an integer number (2491710).

Almost surely, 2^20354823 is an apocalyptic number.

20354823 is a deficient number, since it is larger than the sum of its proper divisors (9545697).

20354823 is a wasteful number, since it uses less digits than its factorization.

20354823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38398 (or 38395 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 20354823 is about 4511.6319663731. The cubic root of 20354823 is about 273.0375909272.

The spelling of 20354823 in words is "twenty million, three hundred fifty-four thousand, eight hundred twenty-three".