20810485 has 4 divisors (see below), whose sum is σ = 24972588. Its totient is φ = 16648384.

The previous prime is 20810483. The next prime is 20810501. The reversal of 20810485 is 58401802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4866436 + 15944049 = 2206^2 + 3993^2 .

It is a cyclic number.

It is not a de Polignac number, because 20810485 - 2¹ = 20810483 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20810483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2081044 + ... + 2081053.

It is an arithmetic number, because the mean of its divisors is an integer number (6243147).

Almost surely, 2^20810485 is an apocalyptic number.

It is an amenable number.

20810485 is a deficient number, since it is larger than the sum of its proper divisors (4162103).

20810485 is an equidigital number, since it uses as much as digits as its factorization.

20810485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4162102.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 20810485 is about 4561.8510497385. The cubic root of 20810485 is about 275.0599758994.

The spelling of 20810485 in words is "twenty million, eight hundred ten thousand, four hundred eighty-five".