20559913783 has 2 divisors, whose sum is σ = 20559913784. Its totient is φ = 20559913782.

The previous prime is 20559913727. The next prime is 20559913823. The reversal of 20559913783 is 38731995502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20559913783 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20559913783.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20559913723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10279956891 + 10279956892.

It is an arithmetic number, because the mean of its divisors is an integer number (10279956892).

Almost surely, 2^20559913783 is an apocalyptic number.

20559913783 is a deficient number, since it is larger than the sum of its proper divisors (1).

20559913783 is an equidigital number, since it uses as much as digits as its factorization.

20559913783 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2041200, while the sum is 52.

The spelling of 20559913783 in words is "twenty billion, five hundred fifty-nine million, nine hundred thirteen thousand, seven hundred eighty-three".