20288687 has 2 divisors, whose sum is σ = 20288688. Its totient is φ = 20288686.

The previous prime is 20288657. The next prime is 20288693. The reversal of 20288687 is 78688202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20288687 - 2⁶ = 20288623 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20288657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10144343 + 10144344.

It is an arithmetic number, because the mean of its divisors is an integer number (10144344).

Almost surely, 2^20288687 is an apocalyptic number.

20288687 is a deficient number, since it is larger than the sum of its proper divisors (1).

20288687 is an equidigital number, since it uses as much as digits as its factorization.

20288687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 20288687 is about 4504.2965044499. The cubic root of 20288687 is about 272.7415561442.

The spelling of 20288687 in words is "twenty million, two hundred eighty-eight thousand, six hundred eighty-seven".