20111601 has 4 divisors (see below), whose sum is σ = 26815472. Its totient is φ = 13407732.

The previous prime is 20111579. The next prime is 20111603. The reversal of 20111601 is 10611102.

It is a happy number.

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 not a de Polignac number, because 20111601 - 2⁵ = 20111569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111603) 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, 3351931 + ... + 3351936.

It is an arithmetic number, because the mean of its divisors is an integer number (6703868).

Almost surely, 2^20111601 is an apocalyptic number.

It is an amenable number.

20111601 is a deficient number, since it is larger than the sum of its proper divisors (6703871).

20111601 is an equidigital number, since it uses as much as digits as its factorization.

20111601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6703870.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 20111601 is about 4484.5959684235. The cubic root of 20111601 is about 271.9457116639.

Adding to 20111601 its reverse (10611102), we get a palindrome (30722703).

The spelling of 20111601 in words is "twenty million, one hundred eleven thousand, six hundred one".