20758321660 has 24 divisors (see below), whose sum is σ = 43833325536. Its totient is φ = 8257452480.

The previous prime is 20758321643. The next prime is 20758321669. The reversal of 20758321660 is 6612385702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20758321669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2863552 + ... + 2870791.

It is an arithmetic number, because the mean of its divisors is an integer number (1826388564).

Almost surely, 2^20758321660 is an apocalyptic number.

20758321660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20758321660 is an abundant number, since it is smaller than the sum of its proper divisors (23075003876).

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

20758321660 is a wasteful number, since it uses less digits than its factorization.

20758321660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5734533 (or 5734531 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 20758321660 in words is "twenty billion, seven hundred fifty-eight million, three hundred twenty-one thousand, six hundred sixty".