20642224 has 20 divisors (see below), whose sum is σ = 41733936. Its totient is φ = 9872192.

The previous prime is 20642213. The next prime is 20642239. The reversal of 20642224 is 42224602.

It is a super-2 number, since 2×20642224² = 852202823332352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20642195 and 20642204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27679 + ... + 28414.

Almost surely, 2^20642224 is an apocalyptic number.

It is an amenable number.

20642224 is an abundant number, since it is smaller than the sum of its proper divisors (21091712).

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

20642224 is a wasteful number, since it uses less digits than its factorization.

20642224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56124 (or 56118 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 20642224 is about 4543.3714353990. The cubic root of 20642224 is about 274.3166460239.

Adding to 20642224 its reverse (42224602), we get a palindrome (62866826).

The spelling of 20642224 in words is "twenty million, six hundred forty-two thousand, two hundred twenty-four".