20078687774609 has 12 divisors (see below), whose sum is σ = 21002595591600. Its totient is φ = 19193837837064.

The previous prime is 20078687774581. The next prime is 20078687774633. The reversal of 20078687774609 is 90647778687002.

It is a de Polignac number, because none of the positive numbers 2^k-20078687774609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20078687774659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10865579 + ... + 12578480.

It is an arithmetic number, because the mean of its divisors is an integer number (1750216299300).

Almost surely, 2^{20078687774609} is an apocalyptic number.

It is an amenable number.

20078687774609 is a deficient number, since it is larger than the sum of its proper divisors (923907816991).

20078687774609 is a wasteful number, since it uses less digits than its factorization.

20078687774609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23445724 (or 23445701 counting only the distinct ones).

The product of its (nonzero) digits is 398297088, while the sum is 71.

The spelling of 20078687774609 in words is "twenty trillion, seventy-eight billion, six hundred eighty-seven million, seven hundred seventy-four thousand, six hundred nine".