20628266 has 4 divisors (see below), whose sum is σ = 30942402. Its totient is φ = 10314132.

The previous prime is 20628247. The next prime is 20628271. The reversal of 20628266 is 66282602.

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., 15880225 + 4748041 = 3985^2 + 2179^2 .

It is a super-3 number, since 3×20628266³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5157065 + ... + 5157068.

Almost surely, 2^20628266 is an apocalyptic number.

20628266 is a deficient number, since it is larger than the sum of its proper divisors (10314136).

20628266 is a wasteful number, since it uses less digits than its factorization.

20628266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10314135.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 20628266 is about 4541.8350916783. The cubic root of 20628266 is about 274.2548023148.

The spelling of 20628266 in words is "twenty million, six hundred twenty-eight thousand, two hundred sixty-six".