20634793 has 2 divisors, whose sum is σ = 20634794. Its totient is φ = 20634792.

The previous prime is 20634791. The next prime is 20634799. The reversal of 20634793 is 39743602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17405584 + 3229209 = 4172^2 + 1797^2 .

It is a cyclic number.

It is not a de Polignac number, because 20634793 - 2¹ = 20634791 is a prime.

Together with 20634791, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20634791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10317396 + 10317397.

It is an arithmetic number, because the mean of its divisors is an integer number (10317397).

Almost surely, 2^20634793 is an apocalyptic number.

It is an amenable number.

20634793 is a deficient number, since it is larger than the sum of its proper divisors (1).

20634793 is an equidigital number, since it uses as much as digits as its factorization.

20634793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 34.

The square root of 20634793 is about 4542.5535770093. The cubic root of 20634793 is about 274.2837249644.

The spelling of 20634793 in words is "twenty million, six hundred thirty-four thousand, seven hundred ninety-three".