20707661 has 8 divisors (see below), whose sum is σ = 22364160. Its totient is φ = 19060272.

The previous prime is 20707651. The next prime is 20707669. The reversal of 20707661 is 16670702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20707661 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20707669) 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, 2900 + ... + 7058.

It is an arithmetic number, because the mean of its divisors is an integer number (2795520).

Almost surely, 2^20707661 is an apocalyptic number.

It is an amenable number.

20707661 is a deficient number, since it is larger than the sum of its proper divisors (1656499).

20707661 is a wasteful number, since it uses less digits than its factorization.

20707661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4555.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 20707661 is about 4550.5671075153. The cubic root of 20707661 is about 274.6062066144.

The spelling of 20707661 in words is "twenty million, seven hundred seven thousand, six hundred sixty-one".