19770880 has 40 divisors (see below), whose sum is σ = 47409912. Its totient is φ = 7907328.

The previous prime is 19770859. The next prime is 19770889. The reversal of 19770880 is 8807791.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19770889) 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, 1302 + ... + 6421.

Almost surely, 2^19770880 is an apocalyptic number.

19770880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19770880 is an abundant number, since it is smaller than the sum of its proper divisors (27639032).

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

19770880 is an frugal number, since it uses more digits than its factorization.

19770880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7746 (or 7730 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 19770880 is about 4446.4457716248. The cubic root of 19770880 is about 270.4012324442.

The spelling of 19770880 in words is "nineteen million, seven hundred seventy thousand, eight hundred eighty".