20428906688 has 14 divisors (see below), whose sum is σ = 40538611836. Its totient is φ = 10214453312.

The previous prime is 20428906651. The next prime is 20428906709. The reversal of 20428906688 is 88660982402.

It is a super-2 number, since 2×20428906688² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159600770 + ... + 159600897.

Almost surely, 2^20428906688 is an apocalyptic number.

It is an amenable number.

20428906688 is a deficient number, since it is larger than the sum of its proper divisors (20109705148).

20428906688 is an equidigital number, since it uses as much as digits as its factorization.

20428906688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319201679 (or 319201669 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 53.

The spelling of 20428906688 in words is "twenty billion, four hundred twenty-eight million, nine hundred six thousand, six hundred eighty-eight".