20789929 has 8 divisors (see below), whose sum is σ = 22143240. Its totient is φ = 19451136.

The previous prime is 20789927. The next prime is 20790017. The reversal of 20789929 is 92998702.

It can be written as a sum of positive squares in 4 ways, for example, as 8714304 + 12075625 = 2952^2 + 3475^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20789929 - 2¹ = 20789927 is a prime.

It is a super-2 number, since 2×20789929² = 864442295650082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20789921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 594 + ... + 6475.

It is an arithmetic number, because the mean of its divisors is an integer number (2767905).

Almost surely, 2^20789929 is an apocalyptic number.

It is an amenable number.

20789929 is a deficient number, since it is larger than the sum of its proper divisors (1353311).

20789929 is a wasteful number, since it uses less digits than its factorization.

20789929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7259.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 20789929 is about 4559.5974603028. The cubic root of 20789929 is about 274.9693806129.

The spelling of 20789929 in words is "twenty million, seven hundred eighty-nine thousand, nine hundred twenty-nine".