20540206 has 4 divisors (see below), whose sum is σ = 30810312. Its totient is φ = 10270102.

The previous prime is 20540171. The next prime is 20540209. The reversal of 20540206 is 60204502.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5135050 + ... + 5135053.

It is an arithmetic number, because the mean of its divisors is an integer number (7702578).

Almost surely, 2^20540206 is an apocalyptic number.

20540206 is a deficient number, since it is larger than the sum of its proper divisors (10270106).

20540206 is a wasteful number, since it uses less digits than its factorization.

20540206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10270105.

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

The square root of 20540206 is about 4532.1304041256. The cubic root of 20540206 is about 273.8639902527.

Adding to 20540206 its reverse (60204502), we get a palindrome (80744708).

The spelling of 20540206 in words is "twenty million, five hundred forty thousand, two hundred six".