20781732360 has 32 divisors (see below), whose sum is σ = 62345197440. Its totient is φ = 5541795264.

The previous prime is 20781732347. The next prime is 20781732371. The reversal of 20781732360 is 6323718702.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86590432 + ... + 86590671.

It is an arithmetic number, because the mean of its divisors is an integer number (1948287420).

Almost surely, 2^20781732360 is an apocalyptic number.

20781732360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20781732360 is an abundant number, since it is smaller than the sum of its proper divisors (41563465080).

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

20781732360 is a wasteful number, since it uses less digits than its factorization.

20781732360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173181117 (or 173181113 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 39.

The spelling of 20781732360 in words is "twenty billion, seven hundred eighty-one million, seven hundred thirty-two thousand, three hundred sixty".