20509448955 has 16 divisors (see below), whose sum is σ = 33434272800. Its totient is φ = 10731987968.

The previous prime is 20509448923. The next prime is 20509448969. The reversal of 20509448955 is 55984490502.

It is a cyclic number.

It is not a de Polignac number, because 20509448955 - 2⁵ = 20509448923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20509448898 and 20509448907.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12898230 + ... + 12899819.

It is an arithmetic number, because the mean of its divisors is an integer number (2089642050).

Almost surely, 2^20509448955 is an apocalyptic number.

20509448955 is a deficient number, since it is larger than the sum of its proper divisors (12924823845).

20509448955 is a wasteful number, since it uses less digits than its factorization.

20509448955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25798110.

The product of its (nonzero) digits is 2592000, while the sum is 51.

The spelling of 20509448955 in words is "twenty billion, five hundred nine million, four hundred forty-eight thousand, nine hundred fifty-five".