19790645 has 16 divisors (see below), whose sum is σ = 27315840. Its totient is φ = 13483584.

The previous prime is 19790633. The next prime is 19790651. The reversal of 19790645 is 54609791.

It is a cyclic number.

It is not a de Polignac number, because 19790645 - 2¹⁶ = 19725109 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3971 + ... + 7439.

It is an arithmetic number, because the mean of its divisors is an integer number (1707240).

Almost surely, 2^19790645 is an apocalyptic number.

It is an amenable number.

19790645 is a deficient number, since it is larger than the sum of its proper divisors (7525195).

19790645 is a wasteful number, since it uses less digits than its factorization.

19790645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3644.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 19790645 is about 4448.6677781107. The cubic root of 19790645 is about 270.4913093719.

The spelling of 19790645 in words is "nineteen million, seven hundred ninety thousand, six hundred forty-five".