20213233 has 2 divisors, whose sum is σ = 20213234. Its totient is φ = 20213232.

The previous prime is 20213197. The next prime is 20213257. The reversal of 20213233 is 33231202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17363889 + 2849344 = 4167^2 + 1688^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213233 - 2⁹ = 20212721 is a prime.

It is not a weakly prime, because it can be changed into another prime (20213273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106616 + 10106617.

It is an arithmetic number, because the mean of its divisors is an integer number (10106617).

Almost surely, 2^20213233 is an apocalyptic number.

It is an amenable number.

20213233 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213233 is an equidigital number, since it uses as much as digits as its factorization.

20213233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 20213233 is about 4495.9129217546. The cubic root of 20213233 is about 272.4030258425.

Adding to 20213233 its reverse (33231202), we get a palindrome (53444435).

It can be divided in two parts, 20 and 213233, that multiplied together give a triangular number (4264660 = T₂₉₂₀).

The spelling of 20213233 in words is "twenty million, two hundred thirteen thousand, two hundred thirty-three".