20887880 has 32 divisors (see below), whose sum is σ = 50614200. Its totient is φ = 7712256.

The previous prime is 20887879. The next prime is 20887891. The reversal of 20887880 is 8878802.

It can be written as a sum of positive squares in 4 ways, for example, as 18679684 + 2208196 = 4322^2 + 1486^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19565 + ... + 20604.

Almost surely, 2^20887880 is an apocalyptic number.

20887880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20887880 is an abundant number, since it is smaller than the sum of its proper divisors (29726320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20887880 is a wasteful number, since it uses less digits than its factorization.

20887880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40193 (or 40189 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 41.

The square root of 20887880 is about 4570.3260277578. The cubic root of 20887880 is about 275.4005402927.

It can be divided in two parts, 208 and 87880, that added together give a palindrome (88088).

The spelling of 20887880 in words is "twenty million, eight hundred eighty-seven thousand, eight hundred eighty".