20646763 has 2 divisors, whose sum is σ = 20646764. Its totient is φ = 20646762.

The previous prime is 20646737. The next prime is 20646797. The reversal of 20646763 is 36764602.

It is an a-pointer prime, because the next prime (20646797) can be obtained adding 20646763 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20646763 - 2²¹ = 18549611 is a prime.

It is not a weakly prime, because it can be changed into another prime (20646163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10323381 + 10323382.

It is an arithmetic number, because the mean of its divisors is an integer number (10323382).

Almost surely, 2^20646763 is an apocalyptic number.

20646763 is a deficient number, since it is larger than the sum of its proper divisors (1).

20646763 is an equidigital number, since it uses as much as digits as its factorization.

20646763 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 20646763 is about 4543.8709268640. The cubic root of 20646763 is about 274.3367509635.

The spelling of 20646763 in words is "twenty million, six hundred forty-six thousand, seven hundred sixty-three".