20829789 has 24 divisors (see below), whose sum is σ = 32078592. Its totient is φ = 12994080.

The previous prime is 20829749. The next prime is 20829821. The reversal of 20829789 is 98792802.

It is not a de Polignac number, because 20829789 - 2²⁰ = 19781213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20829749) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8659 + ... + 10799.

It is an arithmetic number, because the mean of its divisors is an integer number (1336608).

Almost surely, 2^20829789 is an apocalyptic number.

It is an amenable number.

20829789 is a deficient number, since it is larger than the sum of its proper divisors (11248803).

20829789 is a wasteful number, since it uses less digits than its factorization.

20829789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2217 (or 2214 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 20829789 is about 4563.9663670978. The cubic root of 20829789 is about 275.1449990151.

The spelling of 20829789 in words is "twenty million, eight hundred twenty-nine thousand, seven hundred eighty-nine".