20754785567 has 2 divisors, whose sum is σ = 20754785568. Its totient is φ = 20754785566.

The previous prime is 20754785509. The next prime is 20754785591. The reversal of 20754785567 is 76558745702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20754785567 - 2⁶ = 20754785503 is a prime.

It is a super-2 number, since 2×20754785567² (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 (20754785267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10377392783 + 10377392784.

It is an arithmetic number, because the mean of its divisors is an integer number (10377392784).

Almost surely, 2^20754785567 is an apocalyptic number.

20754785567 is a deficient number, since it is larger than the sum of its proper divisors (1).

20754785567 is an equidigital number, since it uses as much as digits as its factorization.

20754785567 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16464000, while the sum is 56.

The spelling of 20754785567 in words is "twenty billion, seven hundred fifty-four million, seven hundred eighty-five thousand, five hundred sixty-seven".