20983808863 has 2 divisors, whose sum is σ = 20983808864. Its totient is φ = 20983808862.

The previous prime is 20983808809. The next prime is 20983808903. The reversal of 20983808863 is 36880838902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20983808863 - 2²¹ = 20981711711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20983808803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10491904431 + 10491904432.

It is an arithmetic number, because the mean of its divisors is an integer number (10491904432).

Almost surely, 2^20983808863 is an apocalyptic number.

20983808863 is a deficient number, since it is larger than the sum of its proper divisors (1).

20983808863 is an equidigital number, since it uses as much as digits as its factorization.

20983808863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3981312, while the sum is 55.

The spelling of 20983808863 in words is "twenty billion, nine hundred eighty-three million, eight hundred eight thousand, eight hundred sixty-three".