20720132557780 has 24 divisors (see below), whose sum is σ = 44249774617440. Its totient is φ = 8147577547680.

The previous prime is 20720132557757. The next prime is 20720132557781. The reversal of 20720132557780 is 8775523102702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20720132557781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8779716006 + ... + 8779718365.

It is an arithmetic number, because the mean of its divisors is an integer number (1843740609060).

Almost surely, 2^{20720132557780} is an apocalyptic number.

20720132557780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20720132557780 is an abundant number, since it is smaller than the sum of its proper divisors (23529642059660).

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

20720132557780 is a wasteful number, since it uses less digits than its factorization.

20720132557780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17559434439 (or 17559434437 counting only the distinct ones).

The product of its (nonzero) digits is 1646400, while the sum is 49.

The spelling of 20720132557780 in words is "twenty trillion, seven hundred twenty billion, one hundred thirty-two million, five hundred fifty-seven thousand, seven hundred eighty".