20013721260220 has 48 divisors (see below), whose sum is σ = 44119914854400. Its totient is φ = 7615937655360.

The previous prime is 20013721260217. The next prime is 20013721260223. The reversal of 20013721260220 is 2206212731002.

It is an interprime number because it is at equal distance from previous prime (20013721260217) and next prime (20013721260223).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013721260223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273524400 + ... + 273597559.

It is an arithmetic number, because the mean of its divisors is an integer number (919164892800).

Almost surely, 2^{20013721260220} is an apocalyptic number.

20013721260220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20013721260220 is an abundant number, since it is smaller than the sum of its proper divisors (24106193594180).

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

20013721260220 is a wasteful number, since it uses less digits than its factorization.

20013721260220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547122058 (or 547122056 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

Adding to 20013721260220 its reverse (2206212731002), we get a palindrome (22219933991222).

The spelling of 20013721260220 in words is "twenty trillion, thirteen billion, seven hundred twenty-one million, two hundred sixty thousand, two hundred twenty".