20888824287 has 4 divisors (see below), whose sum is σ = 27851765720. Its totient is φ = 13925882856.

The previous prime is 20888824283. The next prime is 20888824291. The reversal of 20888824287 is 78242888802.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20888824283) and next prime (20888824291).

It is not a de Polignac number, because 20888824287 - 2² = 20888824283 is a prime.

It is a super-2 number, since 2×20888824287² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20888824283) 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 in 3 ways as a sum of consecutive naturals, for example, 3481470712 + ... + 3481470717.

It is an arithmetic number, because the mean of its divisors is an integer number (6962941430).

Almost surely, 2^20888824287 is an apocalyptic number.

20888824287 is a deficient number, since it is larger than the sum of its proper divisors (6962941433).

20888824287 is an equidigital number, since it uses as much as digits as its factorization.

20888824287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6962941432.

The product of its (nonzero) digits is 7340032, while the sum is 57.

The spelling of 20888824287 in words is "twenty billion, eight hundred eighty-eight million, eight hundred twenty-four thousand, two hundred eighty-seven".