20651224 has 16 divisors (see below), whose sum is σ = 42241320. Its totient is φ = 9386880.

The previous prime is 20651221. The next prime is 20651237. The reversal of 20651224 is 42215602.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 20651195 and 20651204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20651221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117249 + ... + 117424.

Almost surely, 2^20651224 is an apocalyptic number.

It is an amenable number.

20651224 is an abundant number, since it is smaller than the sum of its proper divisors (21590096).

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

20651224 is a wasteful number, since it uses less digits than its factorization.

20651224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234690 (or 234686 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20651224 is about 4544.3617813726. The cubic root of 20651224 is about 274.3565075410.

Adding to 20651224 its reverse (42215602), we get a palindrome (62866826).

The spelling of 20651224 in words is "twenty million, six hundred fifty-one thousand, two hundred twenty-four".