20766002 has 4 divisors (see below), whose sum is σ = 31149006. Its totient is φ = 10383000.

The previous prime is 20765999. The next prime is 20766007. The reversal of 20766002 is 20066702.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20066702 = 2 ⋅10033351.

It can be written as a sum of positive squares in only one way, i.e., 19989841 + 776161 = 4471^2 + 881^2 .

It is not an unprimeable number, because it can be changed into a prime (20766007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5191499 + ... + 5191502.

Almost surely, 2^20766002 is an apocalyptic number.

20766002 is a deficient number, since it is larger than the sum of its proper divisors (10383004).

20766002 is a wasteful number, since it uses less digits than its factorization.

20766002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10383003.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 20766002 is about 4556.9728987564. The cubic root of 20766002 is about 274.8638532689.

The spelling of 20766002 in words is "twenty million, seven hundred sixty-six thousand, two".