19620945 has 24 divisors (see below), whose sum is σ = 34112832. Its totient is φ = 10432800.

The previous prime is 19620929. The next prime is 19620947. The reversal of 19620945 is 54902691.

It is not a de Polignac number, because 19620945 - 2⁴ = 19620929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19620947) 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 23 ways as a sum of consecutive naturals, for example, 28050 + ... + 28740.

It is an arithmetic number, because the mean of its divisors is an integer number (1421368).

Almost surely, 2^19620945 is an apocalyptic number.

19620945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19620945 is a deficient number, since it is larger than the sum of its proper divisors (14491887).

19620945 is a wasteful number, since it uses less digits than its factorization.

19620945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333 (or 1330 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 19620945 is about 4429.5535892458. The cubic root of 19620945 is about 269.7159564312.

The spelling of 19620945 in words is "nineteen million, six hundred twenty thousand, nine hundred forty-five".