20888247 has 8 divisors (see below), whose sum is σ = 27874800. Its totient is φ = 13913600.

The previous prime is 20888233. The next prime is 20888251. The reversal of 20888247 is 74288802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20888247 - 2¹¹ = 20886199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20888227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2629 + ... + 6977.

It is an arithmetic number, because the mean of its divisors is an integer number (3484350).

Almost surely, 2^20888247 is an apocalyptic number.

20888247 is a deficient number, since it is larger than the sum of its proper divisors (6986553).

20888247 is a wasteful number, since it uses less digits than its factorization.

20888247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5953.

The product of its (nonzero) digits is 57344, while the sum is 39.

The square root of 20888247 is about 4570.3661778899. The cubic root of 20888247 is about 275.4021532122.

The spelling of 20888247 in words is "twenty million, eight hundred eighty-eight thousand, two hundred forty-seven".