20437743768 has 32 divisors (see below), whose sum is σ = 55024695600. Its totient is φ = 6288536448.

The previous prime is 20437743751. The next prime is 20437743769. The reversal of 20437743768 is 86734773402.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20437743768.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20437743769) 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, 32752483 + ... + 32753106.

Almost surely, 2^20437743768 is an apocalyptic number.

It is an amenable number.

20437743768 is an abundant number, since it is smaller than the sum of its proper divisors (34586951832).

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

20437743768 is a wasteful number, since it uses less digits than its factorization.

20437743768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65505611 (or 65505607 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 51.

The spelling of 20437743768 in words is "twenty billion, four hundred thirty-seven million, seven hundred forty-three thousand, seven hundred sixty-eight".