20872985 has 16 divisors (see below), whose sum is σ = 28992000. Its totient is φ = 14129856.

The previous prime is 20872981. The next prime is 20872987. The reversal of 20872985 is 58927802.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20872985 - 2² = 20872981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20872981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1010 + ... + 6539.

It is an arithmetic number, because the mean of its divisors is an integer number (1812000).

Almost surely, 2^20872985 is an apocalyptic number.

It is an amenable number.

20872985 is a deficient number, since it is larger than the sum of its proper divisors (8119015).

20872985 is an equidigital number, since it uses as much as digits as its factorization.

20872985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7640.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 20872985 is about 4568.6962035136. The cubic root of 20872985 is about 275.3350626650.

The spelling of 20872985 in words is "twenty million, eight hundred seventy-two thousand, nine hundred eighty-five".