20266663 has 4 divisors (see below), whose sum is σ = 20446128. Its totient is φ = 20087200.

The previous prime is 20266661. The next prime is 20266681. The reversal of 20266663 is 36666202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36666202 = 2 ⋅18333101.

It is a cyclic number.

It is not a de Polignac number, because 20266663 - 2¹ = 20266661 is a prime.

It is a super-3 number, since 3×20266663³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20266661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89563 + ... + 89788.

It is an arithmetic number, because the mean of its divisors is an integer number (5111532).

Almost surely, 2^20266663 is an apocalyptic number.

20266663 is a deficient number, since it is larger than the sum of its proper divisors (179465).

20266663 is a wasteful number, since it uses less digits than its factorization.

20266663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179464.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 20266663 is about 4501.8510637292. The cubic root of 20266663 is about 272.6428306017.

The spelling of 20266663 in words is "twenty million, two hundred sixty-six thousand, six hundred sixty-three".