20455646751 has 12 divisors (see below), whose sum is σ = 29700141328. Its totient is φ = 13566438144.

The previous prime is 20455646749. The next prime is 20455646777. The reversal of 20455646751 is 15764655402.

20455646751 is a `hidden beast` number, since 2 + 0 + 4 + 556 + 46 + 7 + 51 = 666.

It is not a de Polignac number, because 20455646751 - 2¹ = 20455646749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20455646697 and 20455646706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20455644751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5886475 + ... + 5889948.

Almost surely, 2^20455646751 is an apocalyptic number.

20455646751 is a deficient number, since it is larger than the sum of its proper divisors (9244494577).

20455646751 is a wasteful number, since it uses less digits than its factorization.

20455646751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11776622 (or 11776619 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 45.

The spelling of 20455646751 in words is "twenty billion, four hundred fifty-five million, six hundred forty-six thousand, seven hundred fifty-one".