20634533 has 2 divisors, whose sum is σ = 20634534. Its totient is φ = 20634532.

The previous prime is 20634511. The next prime is 20634541. The reversal of 20634533 is 33543602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17032129 + 3602404 = 4127^2 + 1898^2 .

It is a cyclic number.

It is not a de Polignac number, because 20634533 - 2⁶ = 20634469 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20634553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10317266 + 10317267.

It is an arithmetic number, because the mean of its divisors is an integer number (10317267).

Almost surely, 2^20634533 is an apocalyptic number.

It is an amenable number.

20634533 is a deficient number, since it is larger than the sum of its proper divisors (1).

20634533 is an equidigital number, since it uses as much as digits as its factorization.

20634533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 26.

The square root of 20634533 is about 4542.5249586546. The cubic root of 20634533 is about 274.2825729608.

The spelling of 20634533 in words is "twenty million, six hundred thirty-four thousand, five hundred thirty-three".