20939439 has 8 divisors (see below), whose sum is σ = 27941760. Its totient is φ = 13948376.

The previous prime is 20939419. The next prime is 20939459. The reversal of 20939439 is 93493902.

It is an interprime number because it is at equal distance from previous prime (20939419) and next prime (20939459).

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 20939439 - 2⁹ = 20938927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20939397 and 20939406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20939419) 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, 3652 + ... + 7430.

It is an arithmetic number, because the mean of its divisors is an integer number (3492720).

Almost surely, 2^20939439 is an apocalyptic number.

20939439 is a deficient number, since it is larger than the sum of its proper divisors (7002321).

20939439 is a wasteful number, since it uses less digits than its factorization.

With its successor (20939440) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (5629).

20939439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5629.

The product of its (nonzero) digits is 52488, while the sum is 39.

The square root of 20939439 is about 4575.9631772994. The cubic root of 20939439 is about 275.6269508451.

The spelling of 20939439 in words is "twenty million, nine hundred thirty-nine thousand, four hundred thirty-nine".