20650529 has 4 divisors (see below), whose sum is σ = 21865284. Its totient is φ = 19435776.

The previous prime is 20650519. The next prime is 20650541. The reversal of 20650529 is 92505602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6760000 + 13890529 = 2600^2 + 3727^2 .

It is a cyclic number.

It is not a de Polignac number, because 20650529 - 2²⁴ = 3873313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20650519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607352 + ... + 607385.

It is an arithmetic number, because the mean of its divisors is an integer number (5466321).

Almost surely, 2^20650529 is an apocalyptic number.

It is an amenable number.

20650529 is a deficient number, since it is larger than the sum of its proper divisors (1214755).

20650529 is a wasteful number, since it uses less digits than its factorization.

20650529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214754.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 20650529 is about 4544.2853123456. The cubic root of 20650529 is about 274.3534297587.

The spelling of 20650529 in words is "twenty million, six hundred fifty thousand, five hundred twenty-nine".