19980185628 has 24 divisors (see below), whose sum is σ = 50206620688. Its totient is φ = 6147749376.

The previous prime is 19980185611. The next prime is 19980185639. The reversal of 19980185628 is 82658108991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64038901 + ... + 64039212.

Almost surely, 2^19980185628 is an apocalyptic number.

It is an amenable number.

19980185628 is an abundant number, since it is smaller than the sum of its proper divisors (30226435060).

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

19980185628 is a wasteful number, since it uses less digits than its factorization.

19980185628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128078133 (or 128078131 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 57.

The spelling of 19980185628 in words is "nineteen billion, nine hundred eighty million, one hundred eighty-five thousand, six hundred twenty-eight".