19900224 has 42 divisors (see below), whose sum is σ = 57042050. Its totient is φ = 6633216.

The previous prime is 19900193. The next prime is 19900253. The reversal of 19900224 is 42200991.

It can be written as a sum of positive squares in only one way, i.e., 19713600 + 186624 = 4440^2 + 432^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16699 + ... + 17850.

Almost surely, 2^19900224 is an apocalyptic number.

It is an amenable number.

19900224 is an abundant number, since it is smaller than the sum of its proper divisors (37141826).

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

19900224 is a wasteful number, since it uses less digits than its factorization.

19900224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34567 (or 34554 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 19900224 is about 4460.9667113755. The cubic root of 19900224 is about 270.9896193879.

The spelling of 19900224 in words is "nineteen million, nine hundred thousand, two hundred twenty-four".