20676746 has 4 divisors (see below), whose sum is σ = 31015122. Its totient is φ = 10338372.

The previous prime is 20676707. The next prime is 20676781. The reversal of 20676746 is 64767602.

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: 64767602 = 2 ⋅32383801.

It can be written as a sum of positive squares in only one way, i.e., 20151121 + 525625 = 4489^2 + 725^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5169185 + ... + 5169188.

Almost surely, 2^20676746 is an apocalyptic number.

20676746 is a deficient number, since it is larger than the sum of its proper divisors (10338376).

20676746 is a wasteful number, since it uses less digits than its factorization.

20676746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10338375.

The product of its (nonzero) digits is 84672, while the sum is 38.

The square root of 20676746 is about 4547.1690093947. The cubic root of 20676746 is about 274.4694829949.

The spelling of 20676746 in words is "twenty million, six hundred seventy-six thousand, seven hundred forty-six".