20666834 has 16 divisors (see below), whose sum is σ = 32743872. Its totient is φ = 9763248.

The previous prime is 20666827. The next prime is 20666839. The reversal of 20666834 is 43866602.

It is a junction number, because it is equal to n+sod(n) for n = 20666794 and 20666803.

It is not an unprimeable number, because it can be changed into a prime (20666839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1112 + ... + 6524.

It is an arithmetic number, because the mean of its divisors is an integer number (2046492).

Almost surely, 2^20666834 is an apocalyptic number.

20666834 is a deficient number, since it is larger than the sum of its proper divisors (12077038).

20666834 is a wasteful number, since it uses less digits than its factorization.

20666834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5521.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 20666834 is about 4546.0789698376. The cubic root of 20666834 is about 274.4256176731.

The spelling of 20666834 in words is "twenty million, six hundred sixty-six thousand, eight hundred thirty-four".