19949985 has 48 divisors (see below), whose sum is σ = 38683008. Its totient is φ = 9427200.

The previous prime is 19949977. The next prime is 19950013. The reversal of 19949985 is 58994991.

It is not a de Polignac number, because 19949985 - 2³ = 19949977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19804 + ... + 20786.

It is an arithmetic number, because the mean of its divisors is an integer number (805896).

Almost surely, 2^19949985 is an apocalyptic number.

19949985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19949985 is a deficient number, since it is larger than the sum of its proper divisors (18733023).

19949985 is a wasteful number, since it uses less digits than its factorization.

19949985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046 (or 1043 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 54.

The square root of 19949985 is about 4466.5406076739. The cubic root of 19949985 is about 271.2153034542.

It can be divided in two parts, 1994998 and 5, that added together give a triangular number (1995003 = T₁₉₉₇).

The spelling of 19949985 in words is "nineteen million, nine hundred forty-nine thousand, nine hundred eighty-five".