20886266 has 4 divisors (see below), whose sum is σ = 31329402. Its totient is φ = 10443132.

The previous prime is 20886259. The next prime is 20886269. The reversal of 20886266 is 66268802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66268802 = 2 ⋅33134401.

It can be written as a sum of positive squares in only one way, i.e., 14661241 + 6225025 = 3829^2 + 2495^2 .

It is a super-2 number, since 2×20886266² = 872472214845512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20886269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5221565 + ... + 5221568.

Almost surely, 2^20886266 is an apocalyptic number.

20886266 is a deficient number, since it is larger than the sum of its proper divisors (10443136).

20886266 is a wasteful number, since it uses less digits than its factorization.

20886266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10443135.

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 20886266 is about 4570.1494505103. The cubic root of 20886266 is about 275.3934467386.

The spelling of 20886266 in words is "twenty million, eight hundred eighty-six thousand, two hundred sixty-six".