20558222 has 4 divisors (see below), whose sum is σ = 30837336. Its totient is φ = 10279110.

The previous prime is 20558221. The next prime is 20558233. The reversal of 20558222 is 22285502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22285502 = 2 ⋅11142751.

It is a junction number, because it is equal to n+sod(n) for n = 20558191 and 20558200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20558221) 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 as a sum of consecutive naturals, namely, 5139554 + ... + 5139557.

It is an arithmetic number, because the mean of its divisors is an integer number (7709334).

Almost surely, 2^20558222 is an apocalyptic number.

20558222 is a deficient number, since it is larger than the sum of its proper divisors (10279114).

20558222 is a wasteful number, since it uses less digits than its factorization.

20558222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10279113.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 20558222 is about 4534.1175547178. The cubic root of 20558222 is about 273.9440363797.

The spelling of 20558222 in words is "twenty million, five hundred fifty-eight thousand, two hundred twenty-two".