20551226 has 4 divisors (see below), whose sum is σ = 30826842. Its totient is φ = 10275612.

The previous prime is 20551207. The next prime is 20551229. The reversal of 20551226 is 62215502.

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

It can be written as a sum of positive squares in only one way, i.e., 15484225 + 5067001 = 3935^2 + 2251^2 .

It is not an unprimeable number, because it can be changed into a prime (20551229) 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, 5137805 + ... + 5137808.

Almost surely, 2^20551226 is an apocalyptic number.

20551226 is a deficient number, since it is larger than the sum of its proper divisors (10275616).

20551226 is a wasteful number, since it uses less digits than its factorization.

20551226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10275615.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 20551226 is about 4533.3460048843. The cubic root of 20551226 is about 273.9129583044.

Adding to 20551226 its reverse (62215502), we get a palindrome (82766728).

The spelling of 20551226 in words is "twenty million, five hundred fifty-one thousand, two hundred twenty-six".