20087980 has 24 divisors (see below), whose sum is σ = 46020240. Its totient is φ = 7304640.

The previous prime is 20087953. The next prime is 20087989. The reversal of 20087980 is 8978002.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20087989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45435 + ... + 45874.

It is an arithmetic number, because the mean of its divisors is an integer number (1917510).

Almost surely, 2^20087980 is an apocalyptic number.

20087980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20087980 is an abundant number, since it is smaller than the sum of its proper divisors (25932260).

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

20087980 is a wasteful number, since it uses less digits than its factorization.

20087980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91329 (or 91327 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 20087980 is about 4481.9616241106. The cubic root of 20087980 is about 271.8392035488.

The spelling of 20087980 in words is "twenty million, eighty-seven thousand, nine hundred eighty".