20165601 has 4 divisors (see below), whose sum is σ = 26887472. Its totient is φ = 13443732.

The previous prime is 20165567. The next prime is 20165609. The reversal of 20165601 is 10656102.

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 20165601 - 2⁷ = 20165473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20165609) 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, 3360931 + ... + 3360936.

It is an arithmetic number, because the mean of its divisors is an integer number (6721868).

Almost surely, 2^20165601 is an apocalyptic number.

It is an amenable number.

20165601 is a deficient number, since it is larger than the sum of its proper divisors (6721871).

20165601 is an equidigital number, since it uses as much as digits as its factorization.

20165601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6721870.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20165601 is about 4490.6125417364. The cubic root of 20165601 is about 272.1888871455.

The spelling of 20165601 in words is "twenty million, one hundred sixty-five thousand, six hundred one".