20525231251 has 8 divisors (see below), whose sum is σ = 24692007680. Its totient is φ = 16667104968.

The previous prime is 20525231219. The next prime is 20525231281. The reversal of 20525231251 is 15213252502.

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 20525231251 - 2⁵ = 20525231219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20525231281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77162391 + ... + 77162656.

It is an arithmetic number, because the mean of its divisors is an integer number (3086500960).

Almost surely, 2^20525231251 is an apocalyptic number.

20525231251 is a deficient number, since it is larger than the sum of its proper divisors (4166776429).

20525231251 is a wasteful number, since it uses less digits than its factorization.

20525231251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154325073.

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 20525231251 its reverse (15213252502), we get a palindrome (35738483753).

The spelling of 20525231251 in words is "twenty billion, five hundred twenty-five million, two hundred thirty-one thousand, two hundred fifty-one".