19920517 has 4 divisors (see below), whose sum is σ = 19968480. Its totient is φ = 19872556.

The previous prime is 19920499. The next prime is 19920521. The reversal of 19920517 is 71502991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19920517 - 2²³ = 11531909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19920217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23353 + ... + 24190.

It is an arithmetic number, because the mean of its divisors is an integer number (4992120).

Almost surely, 2^19920517 is an apocalyptic number.

It is an amenable number.

19920517 is a deficient number, since it is larger than the sum of its proper divisors (47963).

19920517 is an equidigital number, since it uses as much as digits as its factorization.

19920517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47962.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 19920517 is about 4463.2406388184. The cubic root of 19920517 is about 271.0817008331.

The spelling of 19920517 in words is "nineteen million, nine hundred twenty thousand, five hundred seventeen".