20725713 has 36 divisors (see below), whose sum is σ = 33174960. Its totient is φ = 12894552.

The previous prime is 20725709. The next prime is 20725721. The reversal of 20725713 is 31752702.

20725713 is a `hidden beast` number, since 20 + 72 + 571 + 3 = 666.

It is not a de Polignac number, because 20725713 - 2² = 20725709 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20725723) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 309306 + ... + 309372.

Almost surely, 2^20725713 is an apocalyptic number.

It is an amenable number.

20725713 is a deficient number, since it is larger than the sum of its proper divisors (12449247).

20725713 is an frugal number, since it uses more digits than its factorization.

20725713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 20725713 is about 4552.5501644683. The cubic root of 20725713 is about 274.6859798516.

The spelling of 20725713 in words is "twenty million, seven hundred twenty-five thousand, seven hundred thirteen".