20631906794 has 8 divisors (see below), whose sum is σ = 30948481188. Its totient is φ = 10315746400.

The previous prime is 20631906773. The next prime is 20631906797. The reversal of 20631906794 is 49760913602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18877386025 + 1754520769 = 137395^2 + 41887^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20631906797) 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, 105494 + ... + 228894.

Almost surely, 2^20631906794 is an apocalyptic number.

20631906794 is a deficient number, since it is larger than the sum of its proper divisors (10316574394).

20631906794 is a wasteful number, since it uses less digits than its factorization.

20631906794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207000.

The product of its (nonzero) digits is 489888, while the sum is 47.

The spelling of 20631906794 in words is "twenty billion, six hundred thirty-one million, nine hundred six thousand, seven hundred ninety-four".