19770017988 has 48 divisors (see below), whose sum is σ = 52732108800. Its totient is φ = 5647284384.

The previous prime is 19770017951. The next prime is 19770017999. The reversal of 19770017988 is 88971007791.

It is a super-2 number, since 2×19770017988² (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 (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 378595 + ... + 427637.

It is an arithmetic number, because the mean of its divisors is an integer number (1098585600).

Almost surely, 2^19770017988 is an apocalyptic number.

It is an amenable number.

19770017988 is an abundant number, since it is smaller than the sum of its proper divisors (32962090812).

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

19770017988 is a wasteful number, since it uses less digits than its factorization.

19770017988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53856 (or 53854 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 57.

The spelling of 19770017988 in words is "nineteen billion, seven hundred seventy million, seventeen thousand, nine hundred eighty-eight".