20190251959 has 4 divisors (see below), whose sum is σ = 20208328504. Its totient is φ = 20172175416.

The previous prime is 20190251947. The next prime is 20190251969. The reversal of 20190251959 is 95915209102.

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

It is a cyclic number.

It is not a de Polignac number, because 20190251959 - 2⁷ = 20190251831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20190251969) 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, 9036597 + ... + 9038830.

It is an arithmetic number, because the mean of its divisors is an integer number (5052082126).

Almost surely, 2^20190251959 is an apocalyptic number.

20190251959 is a deficient number, since it is larger than the sum of its proper divisors (18076545).

20190251959 is a wasteful number, since it uses less digits than its factorization.

20190251959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18076544.

The product of its (nonzero) digits is 72900, while the sum is 43.

The spelling of 20190251959 in words is "twenty billion, one hundred ninety million, two hundred fifty-one thousand, nine hundred fifty-nine".