20633953 has 2 divisors, whose sum is σ = 20633954. Its totient is φ = 20633952.

The previous prime is 20633933. The next prime is 20633959. The reversal of 20633953 is 35933602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16916769 + 3717184 = 4113^2 + 1928^2 .

It is a cyclic number.

It is not a de Polignac number, because 20633953 - 2⁹ = 20633441 is a prime.

It is not a weakly prime, because it can be changed into another prime (20633959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10316976 + 10316977.

It is an arithmetic number, because the mean of its divisors is an integer number (10316977).

Almost surely, 2^20633953 is an apocalyptic number.

It is an amenable number.

20633953 is a deficient number, since it is larger than the sum of its proper divisors (1).

20633953 is an equidigital number, since it uses as much as digits as its factorization.

20633953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 31.

The square root of 20633953 is about 4542.4611170598. The cubic root of 20633953 is about 274.2800030717.

The spelling of 20633953 in words is "twenty million, six hundred thirty-three thousand, nine hundred fifty-three".