20781732344 has 16 divisors (see below), whose sum is σ = 38967279120. Its totient is φ = 10390457920.

The previous prime is 20781732341. The next prime is 20781732347. The reversal of 20781732344 is 44323718702.

It is an interprime number because it is at equal distance from previous prime (20781732341) and next prime (20781732347).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20781732341) 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, 360989 + ... + 414579.

It is an arithmetic number, because the mean of its divisors is an integer number (2435454945).

Almost surely, 2^20781732344 is an apocalyptic number.

It is an amenable number.

20781732344 is a deficient number, since it is larger than the sum of its proper divisors (18185546776).

20781732344 is a wasteful number, since it uses less digits than its factorization.

20781732344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102070 (or 102066 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 41.

The spelling of 20781732344 in words is "twenty billion, seven hundred eighty-one million, seven hundred thirty-two thousand, three hundred forty-four".