20968634 has 4 divisors (see below), whose sum is σ = 31452954. Its totient is φ = 10484316.

The previous prime is 20968613. The next prime is 20968693. The reversal of 20968634 is 43686902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17347225 + 3621409 = 4165^2 + 1903^2 .

It is a super-2 number, since 2×20968634² = 879367223651912, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5242157 + ... + 5242160.

Almost surely, 2^20968634 is an apocalyptic number.

20968634 is a deficient number, since it is larger than the sum of its proper divisors (10484320).

20968634 is a wasteful number, since it uses less digits than its factorization.

20968634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10484319.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 20968634 is about 4579.1521049207. The cubic root of 20968634 is about 275.7549898037.

The spelling of 20968634 in words is "twenty million, nine hundred sixty-eight thousand, six hundred thirty-four".