19857996 has 36 divisors (see below), whose sum is σ = 50951992. Its totient is φ = 6519744.

The previous prime is 19857979. The next prime is 19857997. The reversal of 19857996 is 69975891.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (19857997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1705 + ... + 6528.

Almost surely, 2^19857996 is an apocalyptic number.

It is an amenable number.

19857996 is an abundant number, since it is smaller than the sum of its proper divisors (31093996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19857996 is a wasteful number, since it uses less digits than its factorization.

19857996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8310 (or 8305 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 19857996 is about 4456.2311430176. The cubic root of 19857996 is about 270.7978049069.

The spelling of 19857996 in words is "nineteen million, eight hundred fifty-seven thousand, nine hundred ninety-six".