19815952 has 40 divisors (see below), whose sum is σ = 42247296. Its totient is φ = 8946816.

The previous prime is 19815941. The next prime is 19815953. The reversal of 19815952 is 25951891.

It is not an unprimeable number, because it can be changed into a prime (19815953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8763 + ... + 10789.

Almost surely, 2^19815952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19815952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21123648).

19815952 is an abundant number, since it is smaller than the sum of its proper divisors (22431344).

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

19815952 is a wasteful number, since it uses less digits than its factorization.

19815952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2095 (or 2089 counting only the distinct ones).

The product of its digits is 32400, while the sum is 40.

The square root of 19815952 is about 4451.5112040744. The cubic root of 19815952 is about 270.6065558743.

The spelling of 19815952 in words is "nineteen million, eight hundred fifteen thousand, nine hundred fifty-two".