20223551 has 2 divisors, whose sum is σ = 20223552. Its totient is φ = 20223550.

The previous prime is 20223517. The next prime is 20223611. The reversal of 20223551 is 15532202.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20223551 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20223451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10111775 + 10111776.

It is an arithmetic number, because the mean of its divisors is an integer number (10111776).

Almost surely, 2^20223551 is an apocalyptic number.

20223551 is a deficient number, since it is larger than the sum of its proper divisors (1).

20223551 is an equidigital number, since it uses as much as digits as its factorization.

20223551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20223551 is about 4497.0602619934. The cubic root of 20223551 is about 272.4493680303.

Adding to 20223551 its reverse (15532202), we get a palindrome (35755753).

The spelling of 20223551 in words is "twenty million, two hundred twenty-three thousand, five hundred fifty-one".