20709013 has 8 divisors (see below), whose sum is σ = 22353408. Its totient is φ = 19071984.

The previous prime is 20708971. The next prime is 20709041. The reversal of 20709013 is 31090702.

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-20709013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20709053) 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, 4956 + ... + 8122.

It is an arithmetic number, because the mean of its divisors is an integer number (2794176).

Almost surely, 2^20709013 is an apocalyptic number.

It is an amenable number.

20709013 is a deficient number, since it is larger than the sum of its proper divisors (1644395).

20709013 is a wasteful number, since it uses less digits than its factorization.

20709013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3683.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 20709013 is about 4550.7156580037. The cubic root of 20709013 is about 274.6121828167.

Adding to 20709013 its reverse (31090702), we get a palindrome (51799715).

The spelling of 20709013 in words is "twenty million, seven hundred nine thousand, thirteen".