20505623111224 has 16 divisors (see below), whose sum is σ = 38551121203320. Its totient is φ = 10225324123680.

The previous prime is 20505623111203. The next prime is 20505623111249. The reversal of 20505623111224 is 42211132650502.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20505623111224.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3435925822 + ... + 3435931789.

Almost surely, 2^{20505623111224} is an apocalyptic number.

It is an amenable number.

20505623111224 is a deficient number, since it is larger than the sum of its proper divisors (18045498092096).

20505623111224 is a wasteful number, since it uses less digits than its factorization.

20505623111224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6871857990 (or 6871857986 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 20505623111224 its reverse (42211132650502), we get a palindrome (62716755761726).

The spelling of 20505623111224 in words is "twenty trillion, five hundred five billion, six hundred twenty-three million, one hundred eleven thousand, two hundred twenty-four".