20784460191 has 16 divisors (see below), whose sum is σ = 30236160000. Its totient is φ = 12594885120.

The previous prime is 20784460187. The next prime is 20784460199. The reversal of 20784460191 is 19106448702.

It is not a de Polignac number, because 20784460191 - 2² = 20784460187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20784460199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219810 + ... + 299808.

It is an arithmetic number, because the mean of its divisors is an integer number (1889760000).

Almost surely, 2^20784460191 is an apocalyptic number.

20784460191 is a deficient number, since it is larger than the sum of its proper divisors (9451699809).

20784460191 is a wasteful number, since it uses less digits than its factorization.

20784460191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87886.

The product of its (nonzero) digits is 96768, while the sum is 42.

The spelling of 20784460191 in words is "twenty billion, seven hundred eighty-four million, four hundred sixty thousand, one hundred ninety-one".