20781732330 has 32 divisors (see below), whose sum is σ = 55417953600. Its totient is φ = 5541795216.

The previous prime is 20781732287. The next prime is 20781732341. The reversal of 20781732330 is 3323718702.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38484420 + ... + 38484959.

It is an arithmetic number, because the mean of its divisors is an integer number (1731811050).

Almost surely, 2^20781732330 is an apocalyptic number.

20781732330 is an abundant number, since it is smaller than the sum of its proper divisors (34636221270).

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

20781732330 is a wasteful number, since it uses less digits than its factorization.

20781732330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76969395 (or 76969389 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The spelling of 20781732330 in words is "twenty billion, seven hundred eighty-one million, seven hundred thirty-two thousand, three hundred thirty".