20845210 has 16 divisors (see below), whose sum is σ = 37602792. Its totient is φ = 8320000.

The previous prime is 20845207. The next prime is 20845217. The reversal of 20845210 is 1254802.

It can be written as a sum of positive squares in 4 ways, for example, as 8755681 + 12089529 = 2959^2 + 3477^2 .

It is not an unprimeable number, because it can be changed into a prime (20845217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3210 + ... + 7210.

Almost surely, 2^20845210 is an apocalyptic number.

20845210 is a deficient number, since it is larger than the sum of its proper divisors (16757582).

20845210 is a wasteful number, since it uses less digits than its factorization.

20845210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4529.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 20845210 is about 4565.6554841556. The cubic root of 20845210 is about 275.2128819940.

The spelling of 20845210 in words is "twenty million, eight hundred forty-five thousand, two hundred ten".