20238566251 has 8 divisors (see below), whose sum is σ = 20581832000. Its totient is φ = 19896512328.

The previous prime is 20238566239. The next prime is 20238566279. The reversal of 20238566251 is 15266583202.

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 20238566251 - 2⁷ = 20238566123 is a prime.

It is a super-2 number, since 2×20238566251² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20238566221) 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, 269241 + ... + 336106.

It is an arithmetic number, because the mean of its divisors is an integer number (2572729000).

Almost surely, 2^20238566251 is an apocalyptic number.

20238566251 is a deficient number, since it is larger than the sum of its proper divisors (343265749).

20238566251 is an equidigital number, since it uses as much as digits as its factorization.

20238566251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605913.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 20238566251 in words is "twenty billion, two hundred thirty-eight million, five hundred sixty-six thousand, two hundred fifty-one".