20224551 has 16 divisors (see below), whose sum is σ = 27630720. Its totient is φ = 13154400.

The previous prime is 20224549. The next prime is 20224559. The reversal of 20224551 is 15542202.

It is a happy number.

It is not a de Polignac number, because 20224551 - 2¹ = 20224549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20224559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28501 + ... + 29201.

It is an arithmetic number, because the mean of its divisors is an integer number (1726920).

Almost surely, 2^20224551 is an apocalyptic number.

20224551 is a deficient number, since it is larger than the sum of its proper divisors (7406169).

20224551 is a wasteful number, since it uses less digits than its factorization.

20224551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 20224551 is about 4497.1714443637. The cubic root of 20224551 is about 272.4538585848.

Adding to 20224551 its reverse (15542202), we get a palindrome (35766753).

It can be divided in two parts, 202 and 24551, that added together give a triangular number (24753 = T₂₂₂).

The spelling of 20224551 in words is "twenty million, two hundred twenty-four thousand, five hundred fifty-one".