20051224 has 16 divisors (see below), whose sum is σ = 38158200. Its totient is φ = 9875712.

The previous prime is 20051221. The next prime is 20051231. The reversal of 20051224 is 42215002.

It is a junction number, because it is equal to n+sod(n) for n = 20051198 and 20051207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20051221) 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, 18169 + ... + 19240.

Almost surely, 2^20051224 is an apocalyptic number.

It is an amenable number.

20051224 is a deficient number, since it is larger than the sum of its proper divisors (18106976).

20051224 is a wasteful number, since it uses less digits than its factorization.

20051224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37482 (or 37478 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 20051224 is about 4477.8593099828. The cubic root of 20051224 is about 271.6733029773.

Adding to 20051224 its reverse (42215002), we get a palindrome (62266226).

The spelling of 20051224 in words is "twenty million, fifty-one thousand, two hundred twenty-four".