20102151 has 4 divisors (see below), whose sum is σ = 26802872. Its totient is φ = 13401432.

The previous prime is 20102129. The next prime is 20102153. The reversal of 20102151 is 15120102.

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

It is not a de Polignac number, because 20102151 - 2⁵ = 20102119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102153) 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, 3350356 + ... + 3350361.

It is an arithmetic number, because the mean of its divisors is an integer number (6700718).

Almost surely, 2^20102151 is an apocalyptic number.

20102151 is a deficient number, since it is larger than the sum of its proper divisors (6700721).

20102151 is an equidigital number, since it uses as much as digits as its factorization.

20102151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6700720.

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 20102151 is about 4483.5422380078. The cubic root of 20102151 is about 271.9031112167.

Adding to 20102151 its reverse (15120102), we get a palindrome (35222253).

The spelling of 20102151 in words is "twenty million, one hundred two thousand, one hundred fifty-one".