20339929 has 4 divisors (see below), whose sum is σ = 20350480. Its totient is φ = 20329380.

The previous prime is 20339909. The next prime is 20339941. The reversal of 20339929 is 92993302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 92993302 = 2 ⋅46496651.

It is a cyclic number.

It is not a de Polignac number, because 20339929 - 2⁷ = 20339801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20339909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1467 + ... + 6544.

It is an arithmetic number, because the mean of its divisors is an integer number (5087620).

Almost surely, 2^20339929 is an apocalyptic number.

It is an amenable number.

20339929 is a deficient number, since it is larger than the sum of its proper divisors (10551).

20339929 is an equidigital number, since it uses as much as digits as its factorization.

20339929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10550.

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 20339929 is about 4509.9810420888. The cubic root of 20339929 is about 272.9709791278.

The spelling of 20339929 in words is "twenty million, three hundred thirty-nine thousand, nine hundred twenty-nine".