20013251 has 8 divisors (see below), whose sum is σ = 21277200. Its totient is φ = 18770400.

The previous prime is 20013247. The next prime is 20013269. The reversal of 20013251 is 15231002.

It is a happy number.

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 20013251 - 2² = 20013247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20013221) 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, 3296 + ... + 7133.

It is an arithmetic number, because the mean of its divisors is an integer number (2659650).

Almost surely, 2^20013251 is an apocalyptic number.

20013251 is a deficient number, since it is larger than the sum of its proper divisors (1263949).

20013251 is a wasteful number, since it uses less digits than its factorization.

20013251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10549.

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

The square root of 20013251 is about 4473.6172165262. The cubic root of 20013251 is about 271.5016963379.

Adding to 20013251 its reverse (15231002), we get a palindrome (35244253).

The spelling of 20013251 in words is "twenty million, thirteen thousand, two hundred fifty-one".