20642046842 has 16 divisors (see below), whose sum is σ = 33286170240. Its totient is φ = 9569772288.

The previous prime is 20642046811. The next prime is 20642046881. The reversal of 20642046842 is 24864024602.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 20642046796 and 20642046805.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5777063 + ... + 5780634.

It is an arithmetic number, because the mean of its divisors is an integer number (2080385640).

Almost surely, 2^20642046842 is an apocalyptic number.

20642046842 is a deficient number, since it is larger than the sum of its proper divisors (12644123398).

20642046842 is a wasteful number, since it uses less digits than its factorization.

20642046842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11557765.

The product of its (nonzero) digits is 147456, while the sum is 38.

The spelling of 20642046842 in words is "twenty billion, six hundred forty-two million, forty-six thousand, eight hundred forty-two".