20326561426451 has 16 divisors (see below), whose sum is σ = 23302407379968. Its totient is φ = 17368791374400.

The previous prime is 20326561426441. The next prime is 20326561426519. The reversal of 20326561426451 is 15462416562302.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20326561426451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20326561426396 and 20326561426405.

It is not an unprimeable number, because it can be changed into a prime (20326561426441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1245191 + ... + 6496431.

It is an arithmetic number, because the mean of its divisors is an integer number (1456400461248).

Almost surely, 2^{20326561426451} is an apocalyptic number.

20326561426451 is a deficient number, since it is larger than the sum of its proper divisors (2975845953517).

20326561426451 is a wasteful number, since it uses less digits than its factorization.

20326561426451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5252962.

The product of its (nonzero) digits is 2073600, while the sum is 47.

Adding to 20326561426451 its reverse (15462416562302), we get a palindrome (35788977988753).

The spelling of 20326561426451 in words is "twenty trillion, three hundred twenty-six billion, five hundred sixty-one million, four hundred twenty-six thousand, four hundred fifty-one".