20356601 has 4 divisors (see below), whose sum is σ = 20460132. Its totient is φ = 20253072.

The previous prime is 20356597. The next prime is 20356603. The reversal of 20356601 is 10665302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19404025 + 952576 = 4405^2 + 976^2 .

It is a cyclic number.

It is not a de Polignac number, because 20356601 - 2² = 20356597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20356603) 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, 51470 + ... + 51863.

It is an arithmetic number, because the mean of its divisors is an integer number (5115033).

Almost surely, 2^20356601 is an apocalyptic number.

It is an amenable number.

20356601 is a deficient number, since it is larger than the sum of its proper divisors (103531).

20356601 is a wasteful number, since it uses less digits than its factorization.

20356601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103530.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 20356601 is about 4511.8290082848. The cubic root of 20356601 is about 273.0455406680.

The spelling of 20356601 in words is "twenty million, three hundred fifty-six thousand, six hundred one".