20631022351 has 4 divisors (see below), whose sum is σ = 20823835752. Its totient is φ = 20438208952.

The previous prime is 20631022267. The next prime is 20631022361. The reversal of 20631022351 is 15322013602.

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 20631022351 - 2¹¹ = 20631020303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20631022361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96406540 + ... + 96406753.

It is an arithmetic number, because the mean of its divisors is an integer number (5205958938).

Almost surely, 2^20631022351 is an apocalyptic number.

20631022351 is a deficient number, since it is larger than the sum of its proper divisors (192813401).

20631022351 is a wasteful number, since it uses less digits than its factorization.

20631022351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192813400.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 20631022351 its reverse (15322013602), we get a palindrome (35953035953).

The spelling of 20631022351 in words is "twenty billion, six hundred thirty-one million, twenty-two thousand, three hundred fifty-one".