11657720020 has 12 divisors (see below), whose sum is σ = 24481212084. Its totient is φ = 4663088000.

The previous prime is 11657719979. The next prime is 11657720027. The reversal of 11657720020 is 2002775611.

It can be written as a sum of positive squares in 2 ways, for example, as 8157341124 + 3500378896 = 90318^2 + 59164^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11657720027) 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, 291442981 + ... + 291443020.

It is an arithmetic number, because the mean of its divisors is an integer number (2040101007).

Almost surely, 2^11657720020 is an apocalyptic number.

11657720020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11657720020 is an abundant number, since it is smaller than the sum of its proper divisors (12823492064).

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

11657720020 is a wasteful number, since it uses less digits than its factorization.

11657720020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582886010 (or 582886008 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 31.

The spelling of 11657720020 in words is "eleven billion, six hundred fifty-seven million, seven hundred twenty thousand, twenty".