20920039 has 8 divisors (see below), whose sum is σ = 24035328. Its totient is φ = 17836440.

The previous prime is 20920033. The next prime is 20920061. The reversal of 20920039 is 93002902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20920039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20919995 and 20920022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20920033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6487 + ... + 9160.

It is an arithmetic number, because the mean of its divisors is an integer number (3004416).

Almost surely, 2^20920039 is an apocalyptic number.

20920039 is a deficient number, since it is larger than the sum of its proper divisors (3115289).

20920039 is a wasteful number, since it uses less digits than its factorization.

20920039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15845.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 20920039 is about 4573.8429137870. The cubic root of 20920039 is about 275.5418034661.

The spelling of 20920039 in words is "twenty million, nine hundred twenty thousand, thirty-nine".