20610661 has 8 divisors (see below), whose sum is σ = 21104064. Its totient is φ = 20123040.

The previous prime is 20610637. The next prime is 20610679. The reversal of 20610661 is 16601602.

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

It is a cyclic number.

It is not a de Polignac number, because 20610661 - 2⁷ = 20610533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20650661) 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, 6241 + ... + 8953.

It is an arithmetic number, because the mean of its divisors is an integer number (2638008).

Almost surely, 2^20610661 is an apocalyptic number.

It is an amenable number.

20610661 is a deficient number, since it is larger than the sum of its proper divisors (493403).

20610661 is a wasteful number, since it uses less digits than its factorization.

20610661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2891.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20610661 is about 4539.8965847253. The cubic root of 20610661 is about 274.1767600468.

The spelling of 20610661 in words is "twenty million, six hundred ten thousand, six hundred sixty-one".