20640331254092 has 12 divisors (see below), whose sum is σ = 39404268757896. Its totient is φ = 9381968751840.

The previous prime is 20640331254091. The next prime is 20640331254121. The reversal of 20640331254092 is 29045213304602.

It is not an unprimeable number, because it can be changed into a prime (20640331254091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234549218753 + ... + 234549218840.

It is an arithmetic number, because the mean of its divisors is an integer number (3283689063158).

Almost surely, 2^{20640331254092} is an apocalyptic number.

20640331254092 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20640331254092 is a deficient number, since it is larger than the sum of its proper divisors (18763937503804).

20640331254092 is a wasteful number, since it uses less digits than its factorization.

20640331254092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469098437608 (or 469098437606 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

Adding to 20640331254092 its reverse (29045213304602), we get a palindrome (49685544558694).

The spelling of 20640331254092 in words is "twenty trillion, six hundred forty billion, three hundred thirty-one million, two hundred fifty-four thousand, ninety-two".