19996624 has 20 divisors (see below), whose sum is σ = 41023044. Its totient is φ = 9410048.

The previous prime is 19996621. The next prime is 19996649. The reversal of 19996624 is 42669991.

It can be written as a sum of positive squares in 2 ways, for example, as 17372224 + 2624400 = 4168^2 + 1620^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19996621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36487 + ... + 37030.

Almost surely, 2^19996624 is an apocalyptic number.

It is an amenable number.

19996624 is an abundant number, since it is smaller than the sum of its proper divisors (21026420).

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

19996624 is a wasteful number, since it uses less digits than its factorization.

19996624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73542 (or 73536 counting only the distinct ones).

The product of its digits is 209952, while the sum is 46.

The square root of 19996624 is about 4471.7584907953. The cubic root of 19996624 is about 271.4264876769.

The spelling of 19996624 in words is "nineteen million, nine hundred ninety-six thousand, six hundred twenty-four".