20528433 has 12 divisors (see below), whose sum is σ = 30675060. Its totient is φ = 13213536.

The previous prime is 20528429. The next prime is 20528447. The reversal of 20528433 is 33482502.

20528433 is a `hidden beast` number, since 205 + 28 + 433 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15586704 + 4941729 = 3948^2 + 2223^2 .

It is not a de Polignac number, because 20528433 - 2² = 20528429 is a prime.

It is a super-2 number, since 2×20528433² = 842833122870978, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20528397 and 20528406.

It is not an unprimeable number, because it can be changed into a prime (20528423) 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 11 ways as a sum of consecutive naturals, for example, 39066 + ... + 39587.

It is an arithmetic number, because the mean of its divisors is an integer number (2556255).

Almost surely, 2^20528433 is an apocalyptic number.

It is an amenable number.

20528433 is a deficient number, since it is larger than the sum of its proper divisors (10146627).

20528433 is a wasteful number, since it uses less digits than its factorization.

20528433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78688 (or 78685 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 20528433 is about 4530.8313806629. The cubic root of 20528433 is about 273.8116568444.

The spelling of 20528433 in words is "twenty million, five hundred twenty-eight thousand, four hundred thirty-three".