20552839 has 4 divisors (see below), whose sum is σ = 21030856. Its totient is φ = 20074824.

The previous prime is 20552837. The next prime is 20552843. The reversal of 20552839 is 93825502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93825502 = 2 ⋅46912751.

It is a cyclic number.

It is not a de Polignac number, because 20552839 - 2¹ = 20552837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20552837) 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, 238944 + ... + 239029.

It is an arithmetic number, because the mean of its divisors is an integer number (5257714).

Almost surely, 2^20552839 is an apocalyptic number.

20552839 is a deficient number, since it is larger than the sum of its proper divisors (478017).

20552839 is an equidigital number, since it uses as much as digits as its factorization.

20552839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478016.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 20552839 is about 4533.5239053081. The cubic root of 20552839 is about 273.9201243009.

It can be divided in two parts, 20552 and 839, that multiplied together give a triangular number (17243128 = T₅₈₇₂).

The spelling of 20552839 in words is "twenty million, five hundred fifty-two thousand, eight hundred thirty-nine".