20256247719 has 16 divisors (see below), whose sum is σ = 31588691200. Its totient is φ = 12793419288.

The previous prime is 20256247699. The next prime is 20256247777. The reversal of 20256247719 is 91774265202.

20256247719 is a `hidden beast` number, since 2 + 0 + 2 + 5 + 624 + 7 + 7 + 19 = 666.

It is not a de Polignac number, because 20256247719 - 2¹⁶ = 20256182183 is a prime.

It is a super-2 number, since 2×20256247719² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20256247019) 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 15 ways as a sum of consecutive naturals, for example, 19742419 + ... + 19743444.

It is an arithmetic number, because the mean of its divisors is an integer number (1974293200).

Almost surely, 2^20256247719 is an apocalyptic number.

20256247719 is a deficient number, since it is larger than the sum of its proper divisors (11332443481).

20256247719 is a wasteful number, since it uses less digits than its factorization.

20256247719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39485891 (or 39485885 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 20256247719 in words is "twenty billion, two hundred fifty-six million, two hundred forty-seven thousand, seven hundred nineteen".