20513222 has 8 divisors (see below), whose sum is σ = 30816936. Its totient is φ = 10240912.

The previous prime is 20513191. The next prime is 20513231. The reversal of 20513222 is 22231502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20513222.

It is a congruent number.

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, 6143 + ... + 8874.

It is an arithmetic number, because the mean of its divisors is an integer number (3852117).

Almost surely, 2^20513222 is an apocalyptic number.

20513222 is a deficient number, since it is larger than the sum of its proper divisors (10303714).

20513222 is a wasteful number, since it uses less digits than its factorization.

20513222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15702.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20513222 is about 4529.1524593460. The cubic root of 20513222 is about 273.7440111837.

Adding to 20513222 its reverse (22231502), we get a palindrome (42744724).

The spelling of 20513222 in words is "twenty million, five hundred thirteen thousand, two hundred twenty-two".