20194737987 has 4 divisors (see below), whose sum is σ = 26926317320. Its totient is φ = 13463158656.

The previous prime is 20194737961. The next prime is 20194737989. The reversal of 20194737987 is 78973749102.

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

It is not a de Polignac number, because 20194737987 - 2³⁴ = 3014868803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20194737989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3365789662 + ... + 3365789667.

It is an arithmetic number, because the mean of its divisors is an integer number (6731579330).

Almost surely, 2^20194737987 is an apocalyptic number.

20194737987 is a deficient number, since it is larger than the sum of its proper divisors (6731579333).

20194737987 is an equidigital number, since it uses as much as digits as its factorization.

20194737987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6731579332.

The product of its (nonzero) digits is 5334336, while the sum is 57.

The spelling of 20194737987 in words is "twenty billion, one hundred ninety-four million, seven hundred thirty-seven thousand, nine hundred eighty-seven".