20243940687 has 8 divisors (see below), whose sum is σ = 29991023280. Its totient is φ = 13495960440.

The previous prime is 20243940677. The next prime is 20243940707. The reversal of 20243940687 is 78604934202.

20243940687 is a `hidden beast` number, since 202 + 4 + 39 + 406 + 8 + 7 = 666.

It is not a de Polignac number, because 20243940687 - 2⁴ = 20243940671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20243940677) 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, 374887764 + ... + 374887817.

It is an arithmetic number, because the mean of its divisors is an integer number (3748877910).

Almost surely, 2^20243940687 is an apocalyptic number.

20243940687 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20243940687 is a deficient number, since it is larger than the sum of its proper divisors (9747082593).

20243940687 is an equidigital number, since it uses as much as digits as its factorization.

20243940687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749775590 (or 749775584 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 20243940687 in words is "twenty billion, two hundred forty-three million, nine hundred forty thousand, six hundred eighty-seven".