20528919 has 12 divisors (see below), whose sum is σ = 29704792. Its totient is φ = 13662000.

The previous prime is 20528909. The next prime is 20528923. The reversal of 20528919 is 91982502.

It is not a de Polignac number, because 20528919 - 2⁵ = 20528887 is a prime.

It is a super-2 number, since 2×20528919² = 842873030617122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20528909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4569 + ... + 7869.

Almost surely, 2^20528919 is an apocalyptic number.

20528919 is a deficient number, since it is larger than the sum of its proper divisors (9175873).

20528919 is a wasteful number, since it uses less digits than its factorization.

20528919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3998 (or 3995 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 20528919 is about 4530.8850128866. The cubic root of 20528919 is about 273.8138176103.

The spelling of 20528919 in words is "twenty million, five hundred twenty-eight thousand, nine hundred nineteen".