20545206 has 16 divisors (see below), whose sum is σ = 44826048. Its totient is φ = 6225800.

The previous prime is 20545201. The next prime is 20545207. The reversal of 20545206 is 60254502.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20545201) 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, 155580 + ... + 155711.

It is an arithmetic number, because the mean of its divisors is an integer number (2801628).

Almost surely, 2^20545206 is an apocalyptic number.

20545206 is an abundant number, since it is smaller than the sum of its proper divisors (24280842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20545206 is a wasteful number, since it uses less digits than its factorization.

20545206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311307.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 20545206 is about 4532.6819875213. The cubic root of 20545206 is about 273.8862102320.

Adding to 20545206 its reverse (60254502), we get a palindrome (80799708).

It can be divided in two parts, 2054 and 5206, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 20545206 in words is "twenty million, five hundred forty-five thousand, two hundred six".