20891627863 has 2 divisors, whose sum is σ = 20891627864. Its totient is φ = 20891627862.

The previous prime is 20891627831. The next prime is 20891627921. The reversal of 20891627863 is 36872619802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20891627863 - 2⁵ = 20891627831 is a prime.

It is a super-2 number, since 2×20891627863² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20891627863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20891627363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10445813931 + 10445813932.

It is an arithmetic number, because the mean of its divisors is an integer number (10445813932).

Almost surely, 2^20891627863 is an apocalyptic number.

20891627863 is a deficient number, since it is larger than the sum of its proper divisors (1).

20891627863 is an equidigital number, since it uses as much as digits as its factorization.

20891627863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 20891627863 in words is "twenty billion, eight hundred ninety-one million, six hundred twenty-seven thousand, eight hundred sixty-three".