19520807 has 2 divisors, whose sum is σ = 19520808. Its totient is φ = 19520806.

The previous prime is 19520779. The next prime is 19520819. The reversal of 19520807 is 70802591.

It is a strong prime.

It is an emirp because it is prime and its reverse (70802591) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19520807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19520107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9760403 + 9760404.

It is an arithmetic number, because the mean of its divisors is an integer number (9760404).

Almost surely, 2^19520807 is an apocalyptic number.

19520807 is a deficient number, since it is larger than the sum of its proper divisors (1).

19520807 is an equidigital number, since it uses as much as digits as its factorization.

19520807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 19520807 is about 4418.2357338648. The cubic root of 19520807 is about 269.2563303392.

The spelling of 19520807 in words is "nineteen million, five hundred twenty thousand, eight hundred seven".