20122251 has 8 divisors (see below), whose sum is σ = 27400704. Its totient is φ = 13129320.

The previous prime is 20122241. The next prime is 20122343. The reversal of 20122251 is 15222102.

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

It is not a de Polignac number, because 20122251 - 2¹¹ = 20120203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20122251.

It is not an unprimeable number, because it can be changed into a prime (20122241) 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 7 ways as a sum of consecutive naturals, for example, 71215 + ... + 71496.

It is an arithmetic number, because the mean of its divisors is an integer number (3425088).

Almost surely, 2^20122251 is an apocalyptic number.

20122251 is a deficient number, since it is larger than the sum of its proper divisors (7278453).

20122251 is a wasteful number, since it uses less digits than its factorization.

20122251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142761.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 20122251 is about 4485.7832092066. The cubic root of 20122251 is about 271.9937057007.

Adding to 20122251 its reverse (15222102), we get a palindrome (35344353).

The spelling of 20122251 in words is "twenty million, one hundred twenty-two thousand, two hundred fifty-one".