20580985 has 8 divisors (see below), whose sum is σ = 24892416. Its totient is φ = 16334640.

The previous prime is 20580979. The next prime is 20580997. The reversal of 20580985 is 58908502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20580985 - 2³ = 20580977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15571 + ... + 16840.

It is an arithmetic number, because the mean of its divisors is an integer number (3111552).

Almost surely, 2^20580985 is an apocalyptic number.

It is an amenable number.

20580985 is a deficient number, since it is larger than the sum of its proper divisors (4311431).

20580985 is a wasteful number, since it uses less digits than its factorization.

20580985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32543.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 20580985 is about 4536.6270510149. The cubic root of 20580985 is about 274.0451068581.

The spelling of 20580985 in words is "twenty million, five hundred eighty thousand, nine hundred eighty-five".