19770380 has 48 divisors (see below), whose sum is σ = 47712000. Its totient is φ = 6740928.

The previous prime is 19770353. The next prime is 19770383. The reversal of 19770380 is 8307791.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 19770380.

It is not an unprimeable number, because it can be changed into a prime (19770383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39371 + ... + 39869.

It is an arithmetic number, because the mean of its divisors is an integer number (994000).

Almost surely, 2^19770380 is an apocalyptic number.

19770380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19770380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23856000).

19770380 is an abundant number, since it is smaller than the sum of its proper divisors (27941620).

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

19770380 is a wasteful number, since it uses less digits than its factorization.

19770380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798 (or 796 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 19770380 is about 4446.3895465872. The cubic root of 19770380 is about 270.3989529679.

The spelling of 19770380 in words is "nineteen million, seven hundred seventy thousand, three hundred eighty".