20191656968 has 36 divisors (see below), whose sum is σ = 44046613485. Its totient is φ = 8652361536.

The previous prime is 20191656949. The next prime is 20191656997. The reversal of 20191656968 is 86965619102.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 15119653444 + 5072003524 = 122962^2 + 71218^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=100478.

It is a super-2 number, since 2×20191656968² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2809796 + ... + 2816972.

Almost surely, 2^20191656968 is an apocalyptic number.

20191656968 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20191656968 is an abundant number, since it is smaller than the sum of its proper divisors (23854956517).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20191656968 is an frugal number, since it uses more digits than its factorization.

20191656968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14374 (or 7186 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 53.

The spelling of 20191656968 in words is "twenty billion, one hundred ninety-one million, six hundred fifty-six thousand, nine hundred sixty-eight".