20535722680 has 64 divisors (see below), whose sum is σ = 50425804800. Its totient is φ = 7464581760.

The previous prime is 20535722663. The next prime is 20535722681. The reversal of 20535722680 is 8622753502.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20535722681) 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, 1322401 + ... + 1337839.

It is an arithmetic number, because the mean of its divisors is an integer number (787903200).

Almost surely, 2^20535722680 is an apocalyptic number.

20535722680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20535722680 is an abundant number, since it is smaller than the sum of its proper divisors (29890082120).

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

20535722680 is a wasteful number, since it uses less digits than its factorization.

20535722680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18484 (or 18480 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 40.

The spelling of 20535722680 in words is "twenty billion, five hundred thirty-five million, seven hundred twenty-two thousand, six hundred eighty".