20751266 has 4 divisors (see below), whose sum is σ = 31126902. Its totient is φ = 10375632.

The previous prime is 20751257. The next prime is 20751331. The reversal of 20751266 is 66215702.

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., 14100025 + 6651241 = 3755^2 + 2579^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5187815 + ... + 5187818.

Almost surely, 2^20751266 is an apocalyptic number.

20751266 is a deficient number, since it is larger than the sum of its proper divisors (10375636).

20751266 is a wasteful number, since it uses less digits than its factorization.

20751266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10375635.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20751266 is about 4555.3557490058. The cubic root of 20751266 is about 274.7988214571.

Adding to 20751266 its reverse (66215702), we get a palindrome (86966968).

The spelling of 20751266 in words is "twenty million, seven hundred fifty-one thousand, two hundred sixty-six".