16020181 has 4 divisors (see below), whose sum is σ = 16072672. Its totient is φ = 15967692.

The previous prime is 16020163. The next prime is 16020197. The reversal of 16020181 is 18102061.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18102061 = 29 ⋅624209.

It is a cyclic number.

It is not a de Polignac number, because 16020181 - 2⁹ = 16019669 is a prime.

It is a super-2 number, since 2×16020181² = 513292398545522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16020131) 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, 25785 + ... + 26398.

It is an arithmetic number, because the mean of its divisors is an integer number (4018168).

Almost surely, 2^16020181 is an apocalyptic number.

It is an amenable number.

16020181 is a deficient number, since it is larger than the sum of its proper divisors (52491).

16020181 is an equidigital number, since it uses as much as digits as its factorization.

16020181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52490.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 16020181 is about 4002.5218300467. The cubic root of 16020181 is about 252.0901090788.

The spelling of 16020181 in words is "sixteen million, twenty thousand, one hundred eighty-one".