20842585567 has 2 divisors, whose sum is σ = 20842585568. Its totient is φ = 20842585566.

The previous prime is 20842585541. The next prime is 20842585571. The reversal of 20842585567 is 76558524802.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20842585567 is a prime.

It is a super-2 number, since 2×20842585567² (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 (20842585537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10421292783 + 10421292784.

It is an arithmetic number, because the mean of its divisors is an integer number (10421292784).

Almost surely, 2^20842585567 is an apocalyptic number.

20842585567 is a deficient number, since it is larger than the sum of its proper divisors (1).

20842585567 is an equidigital number, since it uses as much as digits as its factorization.

20842585567 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376000, while the sum is 52.

The spelling of 20842585567 in words is "twenty billion, eight hundred forty-two million, five hundred eighty-five thousand, five hundred sixty-seven".