20820085 has 32 divisors (see below), whose sum is σ = 30183552. Its totient is φ = 13582080.

The previous prime is 20820077. The next prime is 20820101. The reversal of 20820085 is 58002802.

20820085 = T₉₄ + T₉₅ + ... + T₅₀₀.

It is not a de Polignac number, because 20820085 - 2³ = 20820077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26062 + ... + 26848.

It is an arithmetic number, because the mean of its divisors is an integer number (943236).

Almost surely, 2^20820085 is an apocalyptic number.

It is an amenable number.

20820085 is a deficient number, since it is larger than the sum of its proper divisors (9363467).

20820085 is a wasteful number, since it uses less digits than its factorization.

20820085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 20820085 is about 4562.9031328749. The cubic root of 20820085 is about 275.1022649960.

Adding to 20820085 its reverse (58002802), we get a palindrome (78822887).

The spelling of 20820085 in words is "twenty million, eight hundred twenty thousand, eighty-five".