19985497 has 16 divisors (see below), whose sum is σ = 23744512. Its totient is φ = 16465680.

The previous prime is 19985467. The next prime is 19985501. The reversal of 19985497 is 79458991.

It is not a de Polignac number, because 19985497 - 2¹⁵ = 19952729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19985417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19672 + ... + 20662.

It is an arithmetic number, because the mean of its divisors is an integer number (1484032).

Almost surely, 2^19985497 is an apocalyptic number.

It is an amenable number.

19985497 is a deficient number, since it is larger than the sum of its proper divisors (3759015).

19985497 is an equidigital number, since it uses as much as digits as its factorization.

19985497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108.

The product of its digits is 816480, while the sum is 52.

The square root of 19985497 is about 4470.5141762442. The cubic root of 19985497 is about 271.3761337958.

The spelling of 19985497 in words is "nineteen million, nine hundred eighty-five thousand, four hundred ninety-seven".