20402233 has 2 divisors, whose sum is σ = 20402234. Its totient is φ = 20402232.

The previous prime is 20402231. The next prime is 20402251. The reversal of 20402233 is 33220402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12938409 + 7463824 = 3597^2 + 2732^2 .

It is a cyclic number.

It is not a de Polignac number, because 20402233 - 2¹ = 20402231 is a prime.

It is a super-2 number, since 2×20402233² = 832502222772578, which contains 22 as substring.

Together with 20402231, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20402231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201116 + 10201117.

It is an arithmetic number, because the mean of its divisors is an integer number (10201117).

Almost surely, 2^20402233 is an apocalyptic number.

It is an amenable number.

20402233 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402233 is an equidigital number, since it uses as much as digits as its factorization.

20402233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 20402233 is about 4516.8831067452. The cubic root of 20402233 is about 273.2494109136.

Adding to 20402233 its reverse (33220402), we get a palindrome (53622635).

The spelling of 20402233 in words is "twenty million, four hundred two thousand, two hundred thirty-three".