20509222 has 8 divisors (see below), whose sum is σ = 31046400. Its totient is φ = 10160424.

The previous prime is 20509213. The next prime is 20509241. The reversal of 20509222 is 22290502.

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

It is a junction number, because it is equal to n+sod(n) for n = 20509193 and 20509202.

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, 46822 + ... + 47257.

It is an arithmetic number, because the mean of its divisors is an integer number (3880800).

Almost surely, 2^20509222 is an apocalyptic number.

20509222 is a deficient number, since it is larger than the sum of its proper divisors (10537178).

20509222 is a wasteful number, since it uses less digits than its factorization.

20509222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94190.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20509222 is about 4528.7108540952. The cubic root of 20509222 is about 273.7262170146.

Adding to 20509222 its reverse (22290502), we get a palindrome (42799724).

The spelling of 20509222 in words is "twenty million, five hundred nine thousand, two hundred twenty-two".