20747039 has 4 divisors (see below), whose sum is σ = 20961024. Its totient is φ = 20533056.

The previous prime is 20747011. The next prime is 20747053. The reversal of 20747039 is 93074702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20747039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20746996 and 20747014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20747239) 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, 106847 + ... + 107040.

It is an arithmetic number, because the mean of its divisors is an integer number (5240256).

Almost surely, 2^20747039 is an apocalyptic number.

20747039 is a deficient number, since it is larger than the sum of its proper divisors (213985).

20747039 is an equidigital number, since it uses as much as digits as its factorization.

20747039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213984.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 20747039 is about 4554.8917660028. The cubic root of 20747039 is about 274.7801614952.

The spelling of 20747039 in words is "twenty million, seven hundred forty-seven thousand, thirty-nine".