20945683 has 16 divisors (see below), whose sum is σ = 24455520. Its totient is φ = 17728000.

The previous prime is 20945651. The next prime is 20945693. The reversal of 20945683 is 38654902.

It is a cyclic number.

It is not a de Polignac number, because 20945683 - 2⁵ = 20945651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20945623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18333 + ... + 19441.

It is an arithmetic number, because the mean of its divisors is an integer number (1528470).

Almost surely, 2^20945683 is an apocalyptic number.

20945683 is a deficient number, since it is larger than the sum of its proper divisors (3509837).

20945683 is a wasteful number, since it uses less digits than its factorization.

20945683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 20945683 is about 4576.6453871804. The cubic root of 20945683 is about 275.6543448239.

It can be divided in two parts, 2094 and 5683, that added together give a palindrome (7777).

The spelling of 20945683 in words is "twenty million, nine hundred forty-five thousand, six hundred eighty-three".