20023151 has 4 divisors (see below), whose sum is σ = 20322072. Its totient is φ = 19724232.

The previous prime is 20023147. The next prime is 20023163. The reversal of 20023151 is 15132002.

It is a happy number.

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 20023151 - 2² = 20023147 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 (20023121) 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, 149360 + ... + 149493.

It is an arithmetic number, because the mean of its divisors is an integer number (5080518).

Almost surely, 2^20023151 is an apocalyptic number.

20023151 is a deficient number, since it is larger than the sum of its proper divisors (298921).

20023151 is an equidigital number, since it uses as much as digits as its factorization.

20023151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298920.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 20023151 is about 4474.7235668810. The cubic root of 20023151 is about 271.5464570769.

Adding to 20023151 its reverse (15132002), we get a palindrome (35155153).

The spelling of 20023151 in words is "twenty million, twenty-three thousand, one hundred fifty-one".