20007880 has 16 divisors (see below), whose sum is σ = 45017820. Its totient is φ = 8003136.

The previous prime is 20007863. The next prime is 20007881. The reversal of 20007880 is 8870002.

It can be written as a sum of positive squares in 2 ways, for example, as 19236996 + 770884 = 4386^2 + 878^2 .

It is not an unprimeable number, because it can be changed into a prime (20007881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250059 + ... + 250138.

Almost surely, 2^20007880 is an apocalyptic number.

20007880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20007880 is an abundant number, since it is smaller than the sum of its proper divisors (25009940).

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

20007880 is a wasteful number, since it uses less digits than its factorization.

20007880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500208 (or 500204 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 20007880 is about 4473.0168790202. The cubic root of 20007880 is about 271.4774063299.

Adding to 20007880 its reverse (8870002), we get a palindrome (28877882).

The spelling of 20007880 in words is "twenty million, seven thousand, eight hundred eighty".