20478095986 has 4 divisors (see below), whose sum is σ = 30717143982. Its totient is φ = 10239047992.

The previous prime is 20478095983. The next prime is 20478096017. The reversal of 20478095986 is 68959087402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20013477961 + 464618025 = 141469^2 + 21555^2 .

It is a super-3 number, since 3×20478095986³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20478095986.

It is not an unprimeable number, because it can be changed into a prime (20478095983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5119523995 + ... + 5119523998.

Almost surely, 2^20478095986 is an apocalyptic number.

20478095986 is a deficient number, since it is larger than the sum of its proper divisors (10239047996).

20478095986 is a wasteful number, since it uses less digits than its factorization.

20478095986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10239047995.

The product of its (nonzero) digits is 8709120, while the sum is 58.

The spelling of 20478095986 in words is "twenty billion, four hundred seventy-eight million, ninety-five thousand, nine hundred eighty-six".