20719713 has 16 divisors (see below), whose sum is σ = 31655936. Its totient is φ = 11808720.

The previous prime is 20719697. The next prime is 20719723. The reversal of 20719713 is 31791702.

It is not a de Polignac number, because 20719713 - 2⁴ = 20719697 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20719723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8658 + ... + 10788.

It is an arithmetic number, because the mean of its divisors is an integer number (1978496).

Almost surely, 2^20719713 is an apocalyptic number.

It is an amenable number.

20719713 is a deficient number, since it is larger than the sum of its proper divisors (10936223).

20719713 is a wasteful number, since it uses less digits than its factorization.

20719713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2604.

The product of its (nonzero) digits is 2646, while the sum is 30.

The square root of 20719713 is about 4551.8911454471. The cubic root of 20719713 is about 274.6594705111.

The spelling of 20719713 in words is "twenty million, seven hundred nineteen thousand, seven hundred thirteen".