19980345 has 32 divisors (see below), whose sum is σ = 39859200. Its totient is φ = 8303040.

The previous prime is 19980299. The next prime is 19980347. The reversal of 19980345 is 54308991.

It is not a de Polignac number, because 19980345 - 2⁶ = 19980281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19980347) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7495 + ... + 9804.

It is an arithmetic number, because the mean of its divisors is an integer number (1245600).

Almost surely, 2^19980345 is an apocalyptic number.

19980345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19980345 is a deficient number, since it is larger than the sum of its proper divisors (19878855).

19980345 is a wasteful number, since it uses less digits than its factorization.

19980345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17325.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 19980345 is about 4469.9379190320. The cubic root of 19980345 is about 271.3528127178.

The spelling of 19980345 in words is "nineteen million, nine hundred eighty thousand, three hundred forty-five".