20617628672 has 44 divisors (see below), whose sum is σ = 42220455816. Its totient is φ = 10057359360.

The previous prime is 20617628671. The next prime is 20617628687. The reversal of 20617628672 is 27682671602.

It is a super-2 number, since 2×20617628672² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20617628671) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 203558 + ... + 287525.

It is an arithmetic number, because the mean of its divisors is an integer number (959555814).

Almost surely, 2^20617628672 is an apocalyptic number.

It is an amenable number.

20617628672 is an abundant number, since it is smaller than the sum of its proper divisors (21602827144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20617628672 is an equidigital number, since it uses as much as digits as its factorization.

20617628672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491144 (or 491126 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 20617628672 in words is "twenty billion, six hundred seventeen million, six hundred twenty-eight thousand, six hundred seventy-two".