20600681 has 4 divisors (see below), whose sum is σ = 20628864. Its totient is φ = 20572500.

The previous prime is 20600677. The next prime is 20600689. The reversal of 20600681 is 18600602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18600602 = 2 ⋅9300301.

It is a cyclic number.

It is not a de Polignac number, because 20600681 - 2² = 20600677 is a prime.

It is a super-2 number, since 2×20600681² = 848776115327522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20600689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12965 + ... + 14466.

It is an arithmetic number, because the mean of its divisors is an integer number (5157216).

Almost surely, 2^20600681 is an apocalyptic number.

It is an amenable number.

20600681 is a deficient number, since it is larger than the sum of its proper divisors (28183).

20600681 is an equidigital number, since it uses as much as digits as its factorization.

20600681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28182.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 20600681 is about 4538.7973076576. The cubic root of 20600681 is about 274.1324993632.

The spelling of 20600681 in words is "twenty million, six hundred thousand, six hundred eighty-one".