20662145 has 16 divisors (see below), whose sum is σ = 28997760. Its totient is φ = 13837824.

The previous prime is 20662133. The next prime is 20662171. The reversal of 20662145 is 54126602.

It is not a de Polignac number, because 20662145 - 2⁴ = 20662129 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5360 + ... + 8369.

It is an arithmetic number, because the mean of its divisors is an integer number (1812360).

Almost surely, 2^20662145 is an apocalyptic number.

It is an amenable number.

20662145 is a deficient number, since it is larger than the sum of its proper divisors (8335615).

20662145 is a wasteful number, since it uses less digits than its factorization.

20662145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13784.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20662145 is about 4545.5632214281. The cubic root of 20662145 is about 274.4048617274.

Adding to 20662145 its reverse (54126602), we get a palindrome (74788747).

The spelling of 20662145 in words is "twenty million, six hundred sixty-two thousand, one hundred forty-five".