20606145 has 24 divisors (see below), whose sum is σ = 37765056. Its totient is φ = 9398688.

The previous prime is 20606143. The next prime is 20606171. The reversal of 20606145 is 54160602.

It is not a de Polignac number, because 20606145 - 2¹ = 20606143 is a prime.

It is a super-2 number, since 2×20606145² = 849226423522050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20606141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46294 + ... + 46736.

It is an arithmetic number, because the mean of its divisors is an integer number (1573544).

Almost surely, 2^20606145 is an apocalyptic number.

It is an amenable number.

20606145 is a deficient number, since it is larger than the sum of its proper divisors (17158911).

20606145 is an frugal number, since it uses more digits than its factorization.

20606145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901 (or 458 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20606145 is about 4539.3991893201. The cubic root of 20606145 is about 274.1567336360.

Adding to 20606145 its reverse (54160602), we get a palindrome (74766747).

The spelling of 20606145 in words is "twenty million, six hundred six thousand, one hundred forty-five".