20162251 has 6 divisors (see below), whose sum is σ = 20355140. Its totient is φ = 19971168.

The previous prime is 20162239. The next prime is 20162257. The reversal of 20162251 is 15226102.

It is not a de Polignac number, because 20162251 - 2⁷ = 20162123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20162257) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11980 + ... + 13558.

Almost surely, 2^20162251 is an apocalyptic number.

20162251 is a deficient number, since it is larger than the sum of its proper divisors (192889).

20162251 is an equidigital number, since it uses as much as digits as its factorization.

20162251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805 (or 1692 counting only the distinct ones).

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

The square root of 20162251 is about 4490.2395259050. The cubic root of 20162251 is about 272.1738138983.

Adding to 20162251 its reverse (15226102), we get a palindrome (35388353).

The spelling of 20162251 in words is "twenty million, one hundred sixty-two thousand, two hundred fifty-one".