19995770386 has 4 divisors (see below), whose sum is σ = 29993655582. Its totient is φ = 9997885192.

The previous prime is 19995770369. The next prime is 19995770401. The reversal of 19995770386 is 68307759991.

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., 12724968025 + 7270802361 = 112805^2 + 85269^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998942595 + ... + 4998942598.

Almost surely, 2^19995770386 is an apocalyptic number.

19995770386 is a deficient number, since it is larger than the sum of its proper divisors (9997885196).

19995770386 is an equidigital number, since it uses as much as digits as its factorization.

19995770386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9997885195.

The product of its (nonzero) digits is 25719120, while the sum is 64.

The spelling of 19995770386 in words is "nineteen billion, nine hundred ninety-five million, seven hundred seventy thousand, three hundred eighty-six".