20731261776222 has 32 divisors (see below), whose sum is σ = 42048040688640. Its totient is φ = 6812841523040.

The previous prime is 20731261776163. The next prime is 20731261776361. The reversal of 20731261776222 is 22267716213702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10955179 + ... + 12707417.

It is an arithmetic number, because the mean of its divisors is an integer number (1314001271520).

Almost surely, 2^{20731261776222} is an apocalyptic number.

20731261776222 is an abundant number, since it is smaller than the sum of its proper divisors (21316778912418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20731261776222 is a wasteful number, since it uses less digits than its factorization.

20731261776222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1780088.

The product of its (nonzero) digits is 1185408, while the sum is 48.

Adding to 20731261776222 its reverse (22267716213702), we get a palindrome (42998977989924).

The spelling of 20731261776222 in words is "twenty trillion, seven hundred thirty-one billion, two hundred sixty-one million, seven hundred seventy-six thousand, two hundred twenty-two".