20666713 has 8 divisors (see below), whose sum is σ = 21924000. Its totient is φ = 19414080.

The previous prime is 20666689. The next prime is 20666743. The reversal of 20666713 is 31766602.

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 20666713 - 2⁹ = 20666201 is a prime.

It is a super-2 number, since 2×20666713² = 854226052448738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20666743) 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, 13038 + ... + 14536.

It is an arithmetic number, because the mean of its divisors is an integer number (2740500).

Almost surely, 2^20666713 is an apocalyptic number.

It is an amenable number.

20666713 is a deficient number, since it is larger than the sum of its proper divisors (1257287).

20666713 is a wasteful number, since it uses less digits than its factorization.

20666713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2327.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 20666713 is about 4546.0656616463. The cubic root of 20666713 is about 274.4250821038.

The spelling of 20666713 in words is "twenty million, six hundred sixty-six thousand, seven hundred thirteen".