20734663 has 2 divisors, whose sum is σ = 20734664. Its totient is φ = 20734662.

The previous prime is 20734633. The next prime is 20734667. The reversal of 20734663 is 36643702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20734663 - 2⁵ = 20734631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20734667) 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, 10367331 + 10367332.

It is an arithmetic number, because the mean of its divisors is an integer number (10367332).

Almost surely, 2^20734663 is an apocalyptic number.

20734663 is a deficient number, since it is larger than the sum of its proper divisors (1).

20734663 is an equidigital number, since it uses as much as digits as its factorization.

20734663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 31.

The square root of 20734663 is about 4553.5330239277. The cubic root of 20734663 is about 274.7255134449.

The spelling of 20734663 in words is "twenty million, seven hundred thirty-four thousand, six hundred sixty-three".