20438831838251 has 8 divisors (see below), whose sum is σ = 20915025299520. Its totient is φ = 19962678003912.

The previous prime is 20438831838247. The next prime is 20438831838319. The reversal of 20438831838251 is 15283813883402.

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 20438831838251 - 2² = 20438831838247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20438831838221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8861885 + ... + 10927518.

It is an arithmetic number, because the mean of its divisors is an integer number (2614378162440).

Almost surely, 2^{20438831838251} is an apocalyptic number.

20438831838251 is a deficient number, since it is larger than the sum of its proper divisors (476193461269).

20438831838251 is a wasteful number, since it uses less digits than its factorization.

20438831838251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19813465.

The product of its (nonzero) digits is 8847360, while the sum is 56.

The spelling of 20438831838251 in words is "twenty trillion, four hundred thirty-eight billion, eight hundred thirty-one million, eight hundred thirty-eight thousand, two hundred fifty-one".