20456641892 has 18 divisors (see below), whose sum is σ = 38028828642. Its totient is φ = 9626654464.

The previous prime is 20456641889. The next prime is 20456641903. The reversal of 20456641892 is 29814665402.

It can be written as a sum of positive squares in 3 ways, for example, as 13925416036 + 6531225856 = 118006^2 + 80816^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8846873 + ... + 8849184.

Almost surely, 2^20456641892 is an apocalyptic number.

It is an amenable number.

20456641892 is a deficient number, since it is larger than the sum of its proper divisors (17572186750).

20456641892 is a wasteful number, since it uses less digits than its factorization.

20456641892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17696095 (or 17696076 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 20456641892 in words is "twenty billion, four hundred fifty-six million, six hundred forty-one thousand, eight hundred ninety-two".