20955649743 has 24 divisors (see below), whose sum is σ = 36628364448. Its totient is φ = 11270264832.

The previous prime is 20955649723. The next prime is 20955649843. The reversal of 20955649743 is 34794655902.

20955649743 is a `hidden beast` number, since 2 + 0 + 9 + 5 + 564 + 9 + 74 + 3 = 666.

It is not a de Polignac number, because 20955649743 - 2⁵ = 20955649711 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20955649743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20955649723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9782146 + ... + 9784287.

It is an arithmetic number, because the mean of its divisors is an integer number (1526181852).

Almost surely, 2^20955649743 is an apocalyptic number.

20955649743 is a deficient number, since it is larger than the sum of its proper divisors (15672714705).

20955649743 is a wasteful number, since it uses less digits than its factorization.

20955649743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19566463 (or 19566460 counting only the distinct ones).

The product of its (nonzero) digits is 8164800, while the sum is 54.

The spelling of 20955649743 in words is "twenty billion, nine hundred fifty-five million, six hundred forty-nine thousand, seven hundred forty-three".