20420222 has 4 divisors (see below), whose sum is σ = 30630336. Its totient is φ = 10210110.

The previous prime is 20420221. The next prime is 20420237. The reversal of 20420222 is 22202402.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 20420197 and 20420206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105054 + ... + 5105057.

It is an arithmetic number, because the mean of its divisors is an integer number (7657584).

Almost surely, 2^20420222 is an apocalyptic number.

20420222 is a deficient number, since it is larger than the sum of its proper divisors (10210114).

20420222 is a wasteful number, since it uses less digits than its factorization.

20420222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10210113.

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 20420222 is about 4518.8739747862. The cubic root of 20420222 is about 273.3296968913.

Adding to 20420222 its reverse (22202402), we get a palindrome (42622624).

The spelling of 20420222 in words is "twenty million, four hundred twenty thousand, two hundred twenty-two".