20858732731 has 2 divisors, whose sum is σ = 20858732732. Its totient is φ = 20858732730.

The previous prime is 20858732711. The next prime is 20858732747. The reversal of 20858732731 is 13723785802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20858732731 - 2²⁷ = 20724515003 is a prime.

It is a super-2 number, since 2×20858732731² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20858732711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10429366365 + 10429366366.

It is an arithmetic number, because the mean of its divisors is an integer number (10429366366).

Almost surely, 2^20858732731 is an apocalyptic number.

20858732731 is a deficient number, since it is larger than the sum of its proper divisors (1).

20858732731 is an equidigital number, since it uses as much as digits as its factorization.

20858732731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 564480, while the sum is 46.

The spelling of 20858732731 in words is "twenty billion, eight hundred fifty-eight million, seven hundred thirty-two thousand, seven hundred thirty-one".