20610005 has 8 divisors (see below), whose sum is σ = 26634552. Its totient is φ = 15219648.

The previous prime is 20609983. The next prime is 20610013. The reversal of 20610005 is 50001602.

It can be written as a sum of positive squares in 4 ways, for example, as 485809 + 20124196 = 697^2 + 4486^2 .

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 20610005 - 2²² = 16415701 is a prime.

It is a super-2 number, since 2×20610005² = 849544612200050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158474 + ... + 158603.

It is an arithmetic number, because the mean of its divisors is an integer number (3329319).

Almost surely, 2^20610005 is an apocalyptic number.

It is an amenable number.

20610005 is a deficient number, since it is larger than the sum of its proper divisors (6024547).

20610005 is a wasteful number, since it uses less digits than its factorization.

20610005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317095.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 20610005 is about 4539.8243358086. The cubic root of 20610005 is about 274.1738511661.

Adding to 20610005 its reverse (50001602), we get a palindrome (70611607).

The spelling of 20610005 in words is "twenty million, six hundred ten thousand, five".