20266553 has 2 divisors, whose sum is σ = 20266554. Its totient is φ = 20266552.

The previous prime is 20266537. The next prime is 20266577. The reversal of 20266553 is 35566202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10582009 + 9684544 = 3253^2 + 3112^2 .

It is a cyclic number.

It is not a de Polignac number, because 20266553 - 2⁴ = 20266537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20266523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10133276 + 10133277.

It is an arithmetic number, because the mean of its divisors is an integer number (10133277).

Almost surely, 2^20266553 is an apocalyptic number.

It is an amenable number.

20266553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20266553 is an equidigital number, since it uses as much as digits as its factorization.

20266553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 20266553 is about 4501.8388465159. The cubic root of 20266553 is about 272.6423373325.

The spelling of 20266553 in words is "twenty million, two hundred sixty-six thousand, five hundred fifty-three".