20742066 has 12 divisors (see below), whose sum is σ = 44941182. Its totient is φ = 6914016.

The previous prime is 20742041. The next prime is 20742077. The reversal of 20742066 is 66024702.

It can be written as a sum of positive squares in only one way, i.e., 20061441 + 680625 = 4479^2 + 825^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 576151 + ... + 576186.

Almost surely, 2^20742066 is an apocalyptic number.

20742066 is an abundant number, since it is smaller than the sum of its proper divisors (24199116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20742066 is a wasteful number, since it uses less digits than its factorization.

20742066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152345 (or 1152342 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 20742066 is about 4554.3458366707. The cubic root of 20742066 is about 274.7582050940.

Adding to 20742066 its reverse (66024702), we get a palindrome (86766768).

The spelling of 20742066 in words is "twenty million, seven hundred forty-two thousand, sixty-six".