20731153 has 2 divisors, whose sum is σ = 20731154. Its totient is φ = 20731152.

The previous prime is 20731133. The next prime is 20731163. The reversal of 20731153 is 35113702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15311569 + 5419584 = 3913^2 + 2328^2 .

It is a cyclic number.

It is not a de Polignac number, because 20731153 - 2⁵ = 20731121 is a prime.

It is not a weakly prime, because it can be changed into another prime (20731133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10365576 + 10365577.

It is an arithmetic number, because the mean of its divisors is an integer number (10365577).

Almost surely, 2^20731153 is an apocalyptic number.

It is an amenable number.

20731153 is a deficient number, since it is larger than the sum of its proper divisors (1).

20731153 is an equidigital number, since it uses as much as digits as its factorization.

20731153 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 20731153 is about 4553.1475926001. The cubic root of 20731153 is about 274.7100105650.

Adding to 20731153 its reverse (35113702), we get a palindrome (55844855).

The spelling of 20731153 in words is "twenty million, seven hundred thirty-one thousand, one hundred fifty-three".