20819529 has 12 divisors (see below), whose sum is σ = 30201600.
Its totient is φ = 13820184.
The previous prime is 20819521. The next prime is 20819563. The reversal of 20819529 is 92591802.
It is not a de Polignac number, because 20819529 - 23 = 20819521 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 20819493 and 20819502.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20819521) 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, 2689 + ... + 6990.
It is an arithmetic number, because the mean of its divisors is an integer number (2516800).
Almost surely, 220819529 is an apocalyptic number.
It is an amenable number.
20819529 is a deficient number, since it is larger than the sum of its proper divisors (9382071).
20819529 is a wasteful number, since it uses less digits than its factorization.
20819529 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 9924 (or 9921 counting only the distinct ones).
The product of its (nonzero) digits is 12960, while the sum is 36.
The square root of 20819529 is about 4562.8422063446.
The cubic root of 20819529 is about 275.0998161072.
The spelling of 20819529 in words is "twenty million, eight hundred nineteen thousand, five hundred twenty-nine".