20045251 has 8 divisors (see below), whose sum is σ = 20824064. Its totient is φ = 19274760.

The previous prime is 20045243. The next prime is 20045257. The reversal of 20045251 is 15254002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20045251 - 2³ = 20045243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20045257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3070 + ... + 7036.

It is an arithmetic number, because the mean of its divisors is an integer number (2603008).

Almost surely, 2^20045251 is an apocalyptic number.

20045251 is a deficient number, since it is larger than the sum of its proper divisors (778813).

20045251 is a wasteful number, since it uses less digits than its factorization.

20045251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4161.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 20045251 is about 4477.1923121528. The cubic root of 20045251 is about 271.6463243118.

Adding to 20045251 its reverse (15254002), we get a palindrome (35299253).

It can be divided in two parts, 200 and 45251, that added together give a triangular number (45451 = T₃₀₁).

The spelling of 20045251 in words is "twenty million, forty-five thousand, two hundred fifty-one".