20665253111254 has 4 divisors (see below), whose sum is σ = 30997879666884. Its totient is φ = 10332626555626.

The previous prime is 20665253111159. The next prime is 20665253111273. The reversal of 20665253111254 is 45211135256602.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20665253111254.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5166313277812 + ... + 5166313277815.

It is an arithmetic number, because the mean of its divisors is an integer number (7749469916721).

Almost surely, 2^{20665253111254} is an apocalyptic number.

20665253111254 is a deficient number, since it is larger than the sum of its proper divisors (10332626555630).

20665253111254 is a wasteful number, since it uses less digits than its factorization.

20665253111254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10332626555629.

The product of its (nonzero) digits is 432000, while the sum is 43.

Adding to 20665253111254 its reverse (45211135256602), we get a palindrome (65876388367856).

The spelling of 20665253111254 in words is "twenty trillion, six hundred sixty-five billion, two hundred fifty-three million, one hundred eleven thousand, two hundred fifty-four".