19897885 has 16 divisors (see below), whose sum is σ = 27361152. Its totient is φ = 13608000.

The previous prime is 19897859. The next prime is 19897903. The reversal of 19897885 is 58879891.

It is not a de Polignac number, because 19897885 - 2⁵ = 19897853 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, 24130 + ... + 24940.

It is an arithmetic number, because the mean of its divisors is an integer number (1710072).

Almost surely, 2^19897885 is an apocalyptic number.

It is an amenable number.

19897885 is a deficient number, since it is larger than the sum of its proper divisors (7463267).

19897885 is an equidigital number, since it uses as much as digits as its factorization.

19897885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524.

The product of its digits is 1451520, while the sum is 55.

The square root of 19897885 is about 4460.7045407648. The cubic root of 19897885 is about 270.9790019269.

The spelling of 19897885 in words is "nineteen million, eight hundred ninety-seven thousand, eight hundred eighty-five".