20528263 has 4 divisors (see below), whose sum is σ = 23460880. Its totient is φ = 17595648.

The previous prime is 20528251. The next prime is 20528267. The reversal of 20528263 is 36282502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36282502 = 2 ⋅18141251.

It is not a de Polignac number, because 20528263 - 2⁹ = 20527751 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 (20528267) 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, 1466298 + ... + 1466311.

It is an arithmetic number, because the mean of its divisors is an integer number (5865220).

Almost surely, 2^20528263 is an apocalyptic number.

20528263 is a deficient number, since it is larger than the sum of its proper divisors (2932617).

20528263 is an equidigital number, since it uses as much as digits as its factorization.

20528263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2932616.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20528263 is about 4530.8126202702. The cubic root of 20528263 is about 273.8109010129.

The spelling of 20528263 in words is "twenty million, five hundred twenty-eight thousand, two hundred sixty-three".