16820131 has 4 divisors (see below), whose sum is σ = 16868952. Its totient is φ = 16771312.

The previous prime is 16820119. The next prime is 16820137. The reversal of 16820131 is 13102861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16820131 - 2⁵ = 16820099 is a prime.

It is a super-2 number, since 2×16820131² = 565833613714322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16820137) 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, 23890 + ... + 24583.

It is an arithmetic number, because the mean of its divisors is an integer number (4217238).

Almost surely, 2^16820131 is an apocalyptic number.

16820131 is a deficient number, since it is larger than the sum of its proper divisors (48821).

16820131 is an equidigital number, since it uses as much as digits as its factorization.

16820131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48820.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 16820131 is about 4101.2353017109. The cubic root of 16820131 is about 256.2180911289.

Adding to 16820131 its reverse (13102861), we get a palindrome (29922992).

The spelling of 16820131 in words is "sixteen million, eight hundred twenty thousand, one hundred thirty-one".