20834661 has 16 divisors (see below), whose sum is σ = 28567616. Its totient is φ = 13499136.

The previous prime is 20834657. The next prime is 20834687. The reversal of 20834661 is 16643802.

It is not a de Polignac number, because 20834661 - 2² = 20834657 is a prime.

It is the 4565-th Hogben number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20834641) by changing a digit.

It is a nontrivial repunit in base 4564.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47901 + ... + 48333.

It is an arithmetic number, because the mean of its divisors is an integer number (1785476).

Almost surely, 2^20834661 is an apocalyptic number.

It is an amenable number.

20834661 is a deficient number, since it is larger than the sum of its proper divisors (7732955).

20834661 is a wasteful number, since it uses less digits than its factorization.

20834661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 20834661 is about 4564.5000821558. The cubic root of 20834661 is about 275.1664490954.

The spelling of 20834661 in words is "twenty million, eight hundred thirty-four thousand, six hundred sixty-one".