20206045 has 4 divisors (see below), whose sum is σ = 24247260. Its totient is φ = 16164832.

The previous prime is 20206037. The next prime is 20206049. The reversal of 20206045 is 54060202.

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 14417209 + 5788836 = 3797^2 + 2406^2 .

It is a cyclic number.

It is not a de Polignac number, because 20206045 - 2³ = 20206037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20206049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2020600 + ... + 2020609.

It is an arithmetic number, because the mean of its divisors is an integer number (6061815).

Almost surely, 2^20206045 is an apocalyptic number.

It is an amenable number.

20206045 is a deficient number, since it is larger than the sum of its proper divisors (4041215).

20206045 is an equidigital number, since it uses as much as digits as its factorization.

20206045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4041214.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20206045 is about 4495.1134579674. The cubic root of 20206045 is about 272.3707323924.

Adding to 20206045 its reverse (54060202), we get a palindrome (74266247).

It can be divided in two parts, 20 and 206045, that multiplied together give a square (4120900 = 2030²).

The spelling of 20206045 in words is "twenty million, two hundred six thousand, forty-five".