20528091 has 6 divisors (see below), whose sum is σ = 29651700. Its totient is φ = 13685388.

The previous prime is 20528087. The next prime is 20528171. The reversal of 20528091 is 19082502.

It is not a de Polignac number, because 20528091 - 2² = 20528087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20528041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1140441 + ... + 1140458.

It is an arithmetic number, because the mean of its divisors is an integer number (4941950).

Almost surely, 2^20528091 is an apocalyptic number.

20528091 is a deficient number, since it is larger than the sum of its proper divisors (9123609).

20528091 is a wasteful number, since it uses less digits than its factorization.

20528091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280905 (or 2280902 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 20528091 is about 4530.7936390880. The cubic root of 20528091 is about 273.8101362850.

The spelling of 20528091 in words is "twenty million, five hundred twenty-eight thousand, ninety-one".