20893687 has 2 divisors, whose sum is σ = 20893688. Its totient is φ = 20893686.

The previous prime is 20893679. The next prime is 20893693. The reversal of 20893687 is 78639802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20893687 - 2³ = 20893679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20893087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10446843 + 10446844.

It is an arithmetic number, because the mean of its divisors is an integer number (10446844).

Almost surely, 2^20893687 is an apocalyptic number.

20893687 is a deficient number, since it is larger than the sum of its proper divisors (1).

20893687 is an equidigital number, since it uses as much as digits as its factorization.

20893687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 20893687 is about 4570.9612774558. The cubic root of 20893687 is about 275.4260591224.

It can be divided in two parts, 2089 and 3687, that added together give a square (5776 = 76²).

The spelling of 20893687 in words is "twenty million, eight hundred ninety-three thousand, six hundred eighty-seven".