20387980 has 12 divisors (see below), whose sum is σ = 42814800. Its totient is φ = 8155184.

The previous prime is 20387953. The next prime is 20387993. The reversal of 20387980 is 8978302.

It is an unprimeable number.

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, 509680 + ... + 509719.

It is an arithmetic number, because the mean of its divisors is an integer number (3567900).

Almost surely, 2^20387980 is an apocalyptic number.

20387980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20387980 is an abundant number, since it is smaller than the sum of its proper divisors (22426820).

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

20387980 is a wasteful number, since it uses less digits than its factorization.

20387980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019408 (or 1019406 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 20387980 is about 4515.3050838232. The cubic root of 20387980 is about 273.1857654107.

The spelling of 20387980 in words is "twenty million, three hundred eighty-seven thousand, nine hundred eighty".