20161855628 has 12 divisors (see below), whose sum is σ = 35286734952. Its totient is φ = 10079931360.

The previous prime is 20161855621. The next prime is 20161855639. The reversal of 20161855628 is 82655816102.

It is not an unprimeable number, because it can be changed into a prime (20161855621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202625 + ... + 285272.

It is an arithmetic number, because the mean of its divisors is an integer number (2940561246).

Almost surely, 2^20161855628 is an apocalyptic number.

It is an amenable number.

20161855628 is a deficient number, since it is larger than the sum of its proper divisors (15124879324).

20161855628 is a wasteful number, since it uses less digits than its factorization.

20161855628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498232 (or 498230 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 44.

The spelling of 20161855628 in words is "twenty billion, one hundred sixty-one million, eight hundred fifty-five thousand, six hundred twenty-eight".