20888487 has 6 divisors (see below), whose sum is σ = 30172272. Its totient is φ = 13925652.

The previous prime is 20888479. The next prime is 20888489. The reversal of 20888487 is 78488802.

It is not a de Polignac number, because 20888487 - 2³ = 20888479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20888489) 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 5 ways as a sum of consecutive naturals, for example, 1160463 + ... + 1160480.

It is an arithmetic number, because the mean of its divisors is an integer number (5028712).

Almost surely, 2^20888487 is an apocalyptic number.

20888487 is a deficient number, since it is larger than the sum of its proper divisors (9283785).

20888487 is a wasteful number, since it uses less digits than its factorization.

20888487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2320949 (or 2320946 counting only the distinct ones).

The product of its (nonzero) digits is 229376, while the sum is 45.

The square root of 20888487 is about 4570.3924339164. The cubic root of 20888487 is about 275.4032079722.

The spelling of 20888487 in words is "twenty million, eight hundred eighty-eight thousand, four hundred eighty-seven".