20195016391 has 8 divisors (see below), whose sum is σ = 22032230400. Its totient is φ = 18358019640.

The previous prime is 20195016389. The next prime is 20195016409. The reversal of 20195016391 is 19361059102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20195016391 - 2¹ = 20195016389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20195016391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20195016341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186490 + ... + 274168.

It is an arithmetic number, because the mean of its divisors is an integer number (2754028800).

Almost surely, 2^20195016391 is an apocalyptic number.

20195016391 is a deficient number, since it is larger than the sum of its proper divisors (1837214009).

20195016391 is a wasteful number, since it uses less digits than its factorization.

20195016391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108629.

The product of its (nonzero) digits is 14580, while the sum is 37.

The spelling of 20195016391 in words is "twenty billion, one hundred ninety-five million, sixteen thousand, three hundred ninety-one".