19780452 has 36 divisors (see below), whose sum is σ = 52943436. Its totient is φ = 6205440.

The previous prime is 19780451. The next prime is 19780457. The reversal of 19780452 is 25408791.

It can be written as a sum of positive squares in 2 ways, for example, as 11451456 + 8328996 = 3384^2 + 2886^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (19780451) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 15549 + ... + 16772.

It is an arithmetic number, because the mean of its divisors is an integer number (1470651).

Almost surely, 2^19780452 is an apocalyptic number.

19780452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19780452 is an abundant number, since it is smaller than the sum of its proper divisors (33162984).

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

19780452 is a wasteful number, since it uses less digits than its factorization.

19780452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32348 (or 32343 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 19780452 is about 4447.5220066909. The cubic root of 19780452 is about 270.4448633298. Note that the first 3 decimals are identical.

The spelling of 19780452 in words is "nineteen million, seven hundred eighty thousand, four hundred fifty-two".