20838529 has 4 divisors (see below), whose sum is σ = 21744576. Its totient is φ = 19932484.

The previous prime is 20838527. The next prime is 20838569. The reversal of 20838529 is 92583802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20838529 - 2¹ = 20838527 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20838527) 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, 452989 + ... + 453034.

It is an arithmetic number, because the mean of its divisors is an integer number (5436144).

Almost surely, 2^20838529 is an apocalyptic number.

It is an amenable number.

20838529 is a deficient number, since it is larger than the sum of its proper divisors (906047).

20838529 is an equidigital number, since it uses as much as digits as its factorization.

20838529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906046.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 20838529 is about 4564.9237671619. The cubic root of 20838529 is about 275.1834764577.

It can be divided in two parts, 2083852 and 9, that added together give a triangular number (2083861 = T₂₀₄₁).

The spelling of 20838529 in words is "twenty million, eight hundred thirty-eight thousand, five hundred twenty-nine".