19788780 has 48 divisors (see below), whose sum is σ = 60447744. Its totient is φ = 4797120.

The previous prime is 19788779. The next prime is 19788781. The reversal of 19788780 is 8788791.

It is an interprime number because it is at equal distance from previous prime (19788779) and next prime (19788781).

It is not an unprimeable number, because it can be changed into a prime (19788781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14332 + ... + 15651.

It is an arithmetic number, because the mean of its divisors is an integer number (1259328).

Almost surely, 2^19788780 is an apocalyptic number.

19788780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19788780 is an abundant number, since it is smaller than the sum of its proper divisors (40658964).

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

19788780 is a wasteful number, since it uses less digits than its factorization.

19788780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30006 (or 30004 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 48.

The square root of 19788780 is about 4448.4581598572. The cubic root of 19788780 is about 270.4828123920.

The spelling of 19788780 in words is "nineteen million, seven hundred eighty-eight thousand, seven hundred eighty".