20520351245111 has 8 divisors (see below), whose sum is σ = 20974754477664. Its totient is φ = 20068437893920.

The previous prime is 20520351245089. The next prime is 20520351245117. The reversal of 20520351245111 is 11154215302502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20520351245111 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 (20520351245117) 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 7 ways as a sum of consecutive naturals, for example, 622453676 + ... + 622486641.

It is an arithmetic number, because the mean of its divisors is an integer number (2621844309708).

Almost surely, 2^{20520351245111} is an apocalyptic number.

20520351245111 is a deficient number, since it is larger than the sum of its proper divisors (454403232553).

20520351245111 is a wasteful number, since it uses less digits than its factorization.

20520351245111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244940681.

The product of its (nonzero) digits is 12000, while the sum is 32.

Adding to 20520351245111 its reverse (11154215302502), we get a palindrome (31674566547613).

The spelling of 20520351245111 in words is "twenty trillion, five hundred twenty billion, three hundred fifty-one million, two hundred forty-five thousand, one hundred eleven".