20540266 has 4 divisors (see below), whose sum is σ = 30810402. Its totient is φ = 10270132.

The previous prime is 20540251. The next prime is 20540279. The reversal of 20540266 is 66204502.

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

It can be written as a sum of positive squares in only one way, i.e., 20205025 + 335241 = 4495^2 + 579^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20540266.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5135065 + ... + 5135068.

Almost surely, 2^20540266 is an apocalyptic number.

20540266 is a deficient number, since it is larger than the sum of its proper divisors (10270136).

20540266 is a wasteful number, since it uses less digits than its factorization.

20540266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10270135.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20540266 is about 4532.1370235243. The cubic root of 20540266 is about 273.8642569138.

Adding to 20540266 its reverse (66204502), we get a palindrome (86744768).

The spelling of 20540266 in words is "twenty million, five hundred forty thousand, two hundred sixty-six".