20556713 has 8 divisors (see below), whose sum is σ = 20846280. Its totient is φ = 20269440.

The previous prime is 20556707. The next prime is 20556743. The reversal of 20556713 is 31765502.

It can be written as a sum of positive squares in 4 ways, for example, as 369664 + 20187049 = 608^2 + 4493^2 .

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 20556713 - 2¹⁴ = 20540329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20556743) 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, 24383 + ... + 25211.

It is an arithmetic number, because the mean of its divisors is an integer number (2605785).

Almost surely, 2^20556713 is an apocalyptic number.

It is an amenable number.

20556713 is a deficient number, since it is larger than the sum of its proper divisors (289567).

20556713 is a wasteful number, since it uses less digits than its factorization.

20556713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 20556713 is about 4533.9511466270. The cubic root of 20556713 is about 273.9373336006.

The spelling of 20556713 in words is "twenty million, five hundred fifty-six thousand, seven hundred thirteen".