20542633 has 2 divisors, whose sum is σ = 20542634. Its totient is φ = 20542632.

The previous prime is 20542603. The next prime is 20542649. The reversal of 20542633 is 33624502.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17539344 + 3003289 = 4188^2 + 1733^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20542633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20542598 and 20542607.

It is not a weakly prime, because it can be changed into another prime (20542603) 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, 10271316 + 10271317.

It is an arithmetic number, because the mean of its divisors is an integer number (10271317).

Almost surely, 2^20542633 is an apocalyptic number.

It is an amenable number.

20542633 is a deficient number, since it is larger than the sum of its proper divisors (1).

20542633 is an equidigital number, since it uses as much as digits as its factorization.

20542633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 20542633 is about 4532.3981510896. The cubic root of 20542633 is about 273.8747762809.

The spelling of 20542633 in words is "twenty million, five hundred forty-two thousand, six hundred thirty-three".