20663762069 has 2 divisors, whose sum is σ = 20663762070. Its totient is φ = 20663762068.

The previous prime is 20663762057. The next prime is 20663762117. The reversal of 20663762069 is 96026736602.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15769080625 + 4894681444 = 125575^2 + 69962^2 .

It is a cyclic number.

It is not a de Polignac number, because 20663762069 - 2²⁰ = 20662713493 is a prime.

It is a super-2 number, since 2×20663762069² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20663762029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10331881034 + 10331881035.

It is an arithmetic number, because the mean of its divisors is an integer number (10331881035).

Almost surely, 2^20663762069 is an apocalyptic number.

It is an amenable number.

20663762069 is a deficient number, since it is larger than the sum of its proper divisors (1).

20663762069 is an equidigital number, since it uses as much as digits as its factorization.

20663762069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 47.

The spelling of 20663762069 in words is "twenty billion, six hundred sixty-three million, seven hundred sixty-two thousand, sixty-nine".