20564601 has 4 divisors (see below), whose sum is σ = 27419472. Its totient is φ = 13709732.

The previous prime is 20564591. The next prime is 20564603. The reversal of 20564601 is 10646502.

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.

It is a cyclic number.

It is not a de Polignac number, because 20564601 - 2⁷ = 20564473 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20564603) 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, 3427431 + ... + 3427436.

It is an arithmetic number, because the mean of its divisors is an integer number (6854868).

Almost surely, 2^20564601 is an apocalyptic number.

It is an amenable number.

20564601 is a deficient number, since it is larger than the sum of its proper divisors (6854871).

20564601 is an equidigital number, since it uses as much as digits as its factorization.

20564601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6854870.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20564601 is about 4534.8209446460. The cubic root of 20564601 is about 273.9723674338.

The spelling of 20564601 in words is "twenty million, five hundred sixty-four thousand, six hundred one".