20909547955 has 8 divisors (see below), whose sum is σ = 25956680400. Its totient is φ = 16150823136.

The previous prime is 20909547941. The next prime is 20909547959. The reversal of 20909547955 is 55974590902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20909547955 - 2²¹ = 20907450803 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20909547896 and 20909547905.

It is not an unprimeable number, because it can be changed into a prime (20909547959) 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 7 ways as a sum of consecutive naturals, for example, 72101745 + ... + 72102034.

It is an arithmetic number, because the mean of its divisors is an integer number (3244585050).

Almost surely, 2^20909547955 is an apocalyptic number.

20909547955 is a deficient number, since it is larger than the sum of its proper divisors (5047132445).

20909547955 is a wasteful number, since it uses less digits than its factorization.

20909547955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144203813.

The product of its (nonzero) digits is 5103000, while the sum is 55.

The spelling of 20909547955 in words is "twenty billion, nine hundred nine million, five hundred forty-seven thousand, nine hundred fifty-five".