20222251 has 32 divisors (see below), whose sum is σ = 25920000. Its totient is φ = 15706656.

The previous prime is 20222249. The next prime is 20222287. The reversal of 20222251 is 15222202.

It is not a de Polignac number, because 20222251 - 2¹ = 20222249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20222201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 188940 + ... + 189046.

It is an arithmetic number, because the mean of its divisors is an integer number (810000).

Almost surely, 2^20222251 is an apocalyptic number.

20222251 is a deficient number, since it is larger than the sum of its proper divisors (5697749).

20222251 is a wasteful number, since it uses less digits than its factorization.

20222251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 20222251 is about 4496.9157208024. The cubic root of 20222251 is about 272.4435300880.

Adding to 20222251 its reverse (15222202), we get a palindrome (35444453).

The spelling of 20222251 in words is "twenty million, two hundred twenty-two thousand, two hundred fifty-one".