20766242 has 16 divisors (see below), whose sum is σ = 35947392. Its totient is φ = 8812800.

The previous prime is 20766241. The next prime is 20766253. The reversal of 20766242 is 24266702.

It is not an unprimeable number, because it can be changed into a prime (20766241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5759 + ... + 8642.

It is an arithmetic number, because the mean of its divisors is an integer number (2246712).

Almost surely, 2^20766242 is an apocalyptic number.

20766242 is a deficient number, since it is larger than the sum of its proper divisors (15181150).

20766242 is a wasteful number, since it uses less digits than its factorization.

20766242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14513.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 20766242 is about 4556.9992319508. Note that the first 3 decimals coincide. The cubic root of 20766242 is about 274.8649121643.

The spelling of 20766242 in words is "twenty million, seven hundred sixty-six thousand, two hundred forty-two".