20201251 has 4 divisors (see below), whose sum is σ = 23087152. Its totient is φ = 17315352.

The previous prime is 20201249. The next prime is 20201267. The reversal of 20201251 is 15210202.

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 20201251 - 2¹ = 20201249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20201231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1442940 + ... + 1442953.

It is an arithmetic number, because the mean of its divisors is an integer number (5771788).

Almost surely, 2^20201251 is an apocalyptic number.

20201251 is a deficient number, since it is larger than the sum of its proper divisors (2885901).

20201251 is an equidigital number, since it uses as much as digits as its factorization.

20201251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2885900.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 20201251 is about 4494.5801806175. The cubic root of 20201251 is about 272.3491901828.

Adding to 20201251 its reverse (15210202), we get a palindrome (35411453).

The spelling of 20201251 in words is "twenty million, two hundred one thousand, two hundred fifty-one".