20634335455 has 4 divisors (see below), whose sum is σ = 24761202552. Its totient is φ = 16507468360.

The previous prime is 20634335431. The next prime is 20634335459. The reversal of 20634335455 is 55453343602.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-20634335455 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20634335459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2063433541 + ... + 2063433550.

It is an arithmetic number, because the mean of its divisors is an integer number (6190300638).

Almost surely, 2^20634335455 is an apocalyptic number.

20634335455 is a deficient number, since it is larger than the sum of its proper divisors (4126867097).

20634335455 is an equidigital number, since it uses as much as digits as its factorization.

20634335455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4126867096.

The product of its (nonzero) digits is 648000, while the sum is 40.

The spelling of 20634335455 in words is "twenty billion, six hundred thirty-four million, three hundred thirty-five thousand, four hundred fifty-five".