20964341457 has 16 divisors (see below), whose sum is σ = 31066766080. Its totient is φ = 13972410576.

The previous prime is 20964341443. The next prime is 20964341459. The reversal of 20964341457 is 75414346902.

20964341457 is a `hidden beast` number, since 209 + 6 + 434 + 1 + 4 + 5 + 7 = 666.

It is not a de Polignac number, because 20964341457 - 2⁶ = 20964341393 is a prime.

It is a super-2 number, since 2×20964341457² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20964341459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3538 + ... + 204795.

It is an arithmetic number, because the mean of its divisors is an integer number (1941672880).

Almost surely, 2^20964341457 is an apocalyptic number.

20964341457 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20964341457 is a deficient number, since it is larger than the sum of its proper divisors (10102424623).

20964341457 is a wasteful number, since it uses less digits than its factorization.

20964341457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212069 (or 212063 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

Subtracting 20964341457 from its reverse (75414346902), we obtain a palindrome (54450005445).

The spelling of 20964341457 in words is "twenty billion, nine hundred sixty-four million, three hundred forty-one thousand, four hundred fifty-seven".