20111316451 has 4 divisors (see below), whose sum is σ = 20112170400. Its totient is φ = 20110462504.

The previous prime is 20111316439. The next prime is 20111316457. The reversal of 20111316451 is 15461311102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111316451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111316457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390616 + ... + 439093.

It is an arithmetic number, because the mean of its divisors is an integer number (5028042600).

Almost surely, 2^20111316451 is an apocalyptic number.

20111316451 is a deficient number, since it is larger than the sum of its proper divisors (853949).

20111316451 is an equidigital number, since it uses as much as digits as its factorization.

20111316451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853948.

The product of its (nonzero) digits is 720, while the sum is 25.

Adding to 20111316451 its reverse (15461311102), we get a palindrome (35572627553).

The spelling of 20111316451 in words is "twenty billion, one hundred eleven million, three hundred sixteen thousand, four hundred fifty-one".