20731261776220 has 24 divisors (see below), whose sum is σ = 43535860898544. Its totient is φ = 8292464487936.

The previous prime is 20731261776163. The next prime is 20731261776361. The reversal of 20731261776220 is 2267716213702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1901647 + ... + 6714073.

It is an arithmetic number, because the mean of its divisors is an integer number (1813994204106).

Almost surely, 2^{20731261776220} is an apocalyptic number.

20731261776220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20731261776220 is an abundant number, since it is smaller than the sum of its proper divisors (22804599122324).

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

20731261776220 is a wasteful number, since it uses less digits than its factorization.

20731261776220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5027829 (or 5027827 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 46.

Adding to 20731261776220 its reverse (2267716213702), we get a palindrome (22998977989922).

The spelling of 20731261776220 in words is "twenty trillion, seven hundred thirty-one billion, two hundred sixty-one million, seven hundred seventy-six thousand, two hundred twenty".