20858211864431 has 2 divisors, whose sum is σ = 20858211864432. Its totient is φ = 20858211864430.

The previous prime is 20858211864407. The next prime is 20858211864461. The reversal of 20858211864431 is 13446811285802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20858211864431 - 2⁶ = 20858211864367 is a prime.

It is a super-2 number, since 2×20858211864431² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20858211864461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10429105932215 + 10429105932216.

It is an arithmetic number, because the mean of its divisors is an integer number (10429105932216).

Almost surely, 2^{20858211864431} is an apocalyptic number.

20858211864431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20858211864431 is an equidigital number, since it uses as much as digits as its factorization.

20858211864431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2949120, while the sum is 53.

The spelling of 20858211864431 in words is "twenty trillion, eight hundred fifty-eight billion, two hundred eleven million, eight hundred sixty-four thousand, four hundred thirty-one".