19940224 has 16 divisors (see below), whose sum is σ = 39724920. Its totient is φ = 9970048.

The previous prime is 19940191. The next prime is 19940237. The reversal of 19940224 is 42204991.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×19940224² = 795225066340352, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77764 + ... + 78019.

Almost surely, 2^19940224 is an apocalyptic number.

It is an amenable number.

19940224 is a deficient number, since it is larger than the sum of its proper divisors (19784696).

19940224 is an equidigital number, since it uses as much as digits as its factorization.

19940224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155797 (or 155785 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 19940224 is about 4465.4477938948. The cubic root of 19940224 is about 271.1710634134.

It can be divided in two parts, 19940 and 224, that added together give a square (20164 = 142²).

The spelling of 19940224 in words is "nineteen million, nine hundred forty thousand, two hundred twenty-four".