20541266 has 4 divisors (see below), whose sum is σ = 30811902. Its totient is φ = 10270632.

The previous prime is 20541259. The next prime is 20541293. The reversal of 20541266 is 66214502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66214502 = 2 ⋅33107251.

It can be written as a sum of positive squares in only one way, i.e., 16851025 + 3690241 = 4105^2 + 1921^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5135315 + ... + 5135318.

Almost surely, 2^20541266 is an apocalyptic number.

20541266 is a deficient number, since it is larger than the sum of its proper divisors (10270636).

20541266 is a wasteful number, since it uses less digits than its factorization.

20541266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10270635.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20541266 is about 4532.2473454126. The cubic root of 20541266 is about 273.8687011894.

Adding to 20541266 its reverse (66214502), we get a palindrome (86755768).

The spelling of 20541266 in words is "twenty million, five hundred forty-one thousand, two hundred sixty-six".