20606090 has 8 divisors (see below), whose sum is σ = 37090980. Its totient is φ = 8242432.

The previous prime is 20606083. The next prime is 20606099. The reversal of 20606090 is 9060602.

It can be written as a sum of positive squares in 2 ways, for example, as 20511841 + 94249 = 4529^2 + 307^2 .

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

It is a super-2 number, since 2×20606090² = 849221890176200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20606099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1030295 + ... + 1030314.

Almost surely, 2^20606090 is an apocalyptic number.

20606090 is a deficient number, since it is larger than the sum of its proper divisors (16484890).

20606090 is a wasteful number, since it uses less digits than its factorization.

20606090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2060616.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20606090 is about 4539.3931312456. The cubic root of 20606090 is about 274.1564897179.

Adding to 20606090 its reverse (9060602), we get a palindrome (29666692).

The spelling of 20606090 in words is "twenty million, six hundred six thousand, ninety".