20840529 has 4 divisors (see below), whose sum is σ = 27787376. Its totient is φ = 13893684.

The previous prime is 20840527. The next prime is 20840537. The reversal of 20840529 is 92504802.

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 not a de Polignac number, because 20840529 - 2¹ = 20840527 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20840496 and 20840505.

It is not an unprimeable number, because it can be changed into a prime (20840527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3473419 + ... + 3473424.

It is an arithmetic number, because the mean of its divisors is an integer number (6946844).

Almost surely, 2^20840529 is an apocalyptic number.

It is an amenable number.

20840529 is a deficient number, since it is larger than the sum of its proper divisors (6946847).

20840529 is an equidigital number, since it uses as much as digits as its factorization.

20840529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6946846.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20840529 is about 4565.1428236146. The cubic root of 20840529 is about 275.1922798518.

The spelling of 20840529 in words is "twenty million, eight hundred forty thousand, five hundred twenty-nine".