20534605 has 16 divisors (see below), whose sum is σ = 30328704. Its totient is φ = 12997440.

The previous prime is 20534603. The next prime is 20534669. The reversal of 20534605 is 50643502.

It is not a de Polignac number, because 20534605 - 2¹ = 20534603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20534605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20534603) 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 15 ways as a sum of consecutive naturals, for example, 22111 + ... + 23020.

It is an arithmetic number, because the mean of its divisors is an integer number (1895544).

Almost surely, 2^20534605 is an apocalyptic number.

It is an amenable number.

20534605 is a deficient number, since it is larger than the sum of its proper divisors (9794099).

20534605 is a wasteful number, since it uses less digits than its factorization.

20534605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45156.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 20534605 is about 4531.5124406759. The cubic root of 20534605 is about 273.8390951493.

The spelling of 20534605 in words is "twenty million, five hundred thirty-four thousand, six hundred five".