19972005 has 16 divisors (see below), whose sum is σ = 32019840. Its totient is φ = 10630208.

The previous prime is 19972003. The next prime is 19972019. The reversal of 19972005 is 50027991.

It is a cyclic number.

It is not a de Polignac number, because 19972005 - 2¹ = 19972003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19972003) 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, 8776 + ... + 10814.

It is an arithmetic number, because the mean of its divisors is an integer number (2001240).

Almost surely, 2^19972005 is an apocalyptic number.

19972005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19972005 is a deficient number, since it is larger than the sum of its proper divisors (12047835).

19972005 is a wasteful number, since it uses less digits than its factorization.

19972005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2700.

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 19972005 is about 4469.0049227988. The cubic root of 19972005 is about 271.3150523187.

Adding to 19972005 its reverse (50027991), we get a palindrome (69999996).

The spelling of 19972005 in words is "nineteen million, nine hundred seventy-two thousand, five".