20528434 has 4 divisors (see below), whose sum is σ = 30792654. Its totient is φ = 10264216.

The previous prime is 20528429. The next prime is 20528447. The reversal of 20528434 is 43482502.

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

It can be written as a sum of positive squares in only one way, i.e., 12938409 + 7590025 = 3597^2 + 2755^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5132107 + ... + 5132110.

Almost surely, 2^20528434 is an apocalyptic number.

20528434 is a deficient number, since it is larger than the sum of its proper divisors (10264220).

20528434 is a wasteful number, since it uses less digits than its factorization.

20528434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10264219.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 20528434 is about 4530.8314910180. The cubic root of 20528434 is about 273.8116612905.

The spelling of 20528434 in words is "twenty million, five hundred twenty-eight thousand, four hundred thirty-four".