19885761780 has 48 divisors (see below), whose sum is σ = 57038192064. Its totient is φ = 5173530880.

The previous prime is 19885761757. The next prime is 19885761827. The reversal of 19885761780 is 8716758891.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4039362 + ... + 4044281.

It is an arithmetic number, because the mean of its divisors is an integer number (1188295668).

Almost surely, 2^19885761780 is an apocalyptic number.

19885761780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19885761780 is an abundant number, since it is smaller than the sum of its proper divisors (37152430284).

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

19885761780 is a wasteful number, since it uses less digits than its factorization.

19885761780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8083696 (or 8083694 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 60.

The spelling of 19885761780 in words is "nineteen billion, eight hundred eighty-five million, seven hundred sixty-one thousand, seven hundred eighty".