20887899 has 4 divisors (see below), whose sum is σ = 27850536. Its totient is φ = 13925264.

The previous prime is 20887891. The next prime is 20887903. The reversal of 20887899 is 99878802.

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

It is a cyclic number.

It is not a de Polignac number, because 20887899 - 2³ = 20887891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20887891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3481314 + ... + 3481319.

It is an arithmetic number, because the mean of its divisors is an integer number (6962634).

Almost surely, 2^20887899 is an apocalyptic number.

20887899 is a deficient number, since it is larger than the sum of its proper divisors (6962637).

20887899 is an equidigital number, since it uses as much as digits as its factorization.

20887899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6962636.

The product of its (nonzero) digits is 580608, while the sum is 51.

The square root of 20887899 is about 4570.3281063836. The cubic root of 20887899 is about 275.4006237958.

The spelling of 20887899 in words is "twenty million, eight hundred eighty-seven thousand, eight hundred ninety-nine".