20105601 has 4 divisors (see below), whose sum is σ = 26807472. Its totient is φ = 13403732.

The previous prime is 20105599. The next prime is 20105627. The reversal of 20105601 is 10650102.

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 20105601 - 2¹ = 20105599 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20105651) 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, 3350931 + ... + 3350936.

It is an arithmetic number, because the mean of its divisors is an integer number (6701868).

Almost surely, 2^20105601 is an apocalyptic number.

It is an amenable number.

20105601 is a deficient number, since it is larger than the sum of its proper divisors (6701871).

20105601 is an equidigital number, since it uses as much as digits as its factorization.

20105601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6701870.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 20105601 is about 4483.9269619386. The cubic root of 20105601 is about 271.9186653079.

Adding to 20105601 its reverse (10650102), we get a palindrome (30755703).

It can be divided in two parts, 20105 and 601, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 20105601 in words is "twenty million, one hundred five thousand, six hundred one".