20145601 has 4 divisors (see below), whose sum is σ = 23023552. Its totient is φ = 17267652.

The previous prime is 20145589. The next prime is 20145607. The reversal of 20145601 is 10654102.

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 20145601 - 2⁹ = 20145089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20145607) 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, 1438965 + ... + 1438978.

It is an arithmetic number, because the mean of its divisors is an integer number (5755888).

Almost surely, 2^20145601 is an apocalyptic number.

It is an amenable number.

20145601 is a deficient number, since it is larger than the sum of its proper divisors (2877951).

20145601 is an equidigital number, since it uses as much as digits as its factorization.

20145601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2877950.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20145601 is about 4488.3851216223. The cubic root of 20145601 is about 272.0988728281.

Adding to 20145601 its reverse (10654102), we get a palindrome (30799703).

The spelling of 20145601 in words is "twenty million, one hundred forty-five thousand, six hundred one".