20162157 has 4 divisors (see below), whose sum is σ = 26882880. Its totient is φ = 13441436.

The previous prime is 20162123. The next prime is 20162167. The reversal of 20162157 is 75126102.

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 a cyclic number.

It is not a de Polignac number, because 20162157 - 2⁷ = 20162029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20162167) 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, 3360357 + ... + 3360362.

It is an arithmetic number, because the mean of its divisors is an integer number (6720720).

Almost surely, 2^20162157 is an apocalyptic number.

It is an amenable number.

20162157 is a deficient number, since it is larger than the sum of its proper divisors (6720723).

20162157 is an equidigital number, since it uses as much as digits as its factorization.

20162157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6720722.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 20162157 is about 4490.2290587452. The cubic root of 20162157 is about 272.1733909234.

Adding to 20162157 its reverse (75126102), we get a palindrome (95288259).

The spelling of 20162157 in words is "twenty million, one hundred sixty-two thousand, one hundred fifty-seven".