20373781778 has 16 divisors (see below), whose sum is σ = 34996488000. Its totient is φ = 8714119536.

The previous prime is 20373781759. The next prime is 20373781789. The reversal of 20373781778 is 87718737302.

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, 1451201 + ... + 1465172.

It is an arithmetic number, because the mean of its divisors is an integer number (2187280500).

Almost surely, 2^20373781778 is an apocalyptic number.

20373781778 is a deficient number, since it is larger than the sum of its proper divisors (14622706222).

20373781778 is a wasteful number, since it uses less digits than its factorization.

20373781778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2916881.

The product of its (nonzero) digits is 2765952, while the sum is 53.

The spelling of 20373781778 in words is "twenty billion, three hundred seventy-three million, seven hundred eighty-one thousand, seven hundred seventy-eight".