20609806 has 16 divisors (see below), whose sum is σ = 35389440. Its totient is φ = 8818200.

The previous prime is 20609801. The next prime is 20609843. The reversal of 20609806 is 60890602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20609801) 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, 15475 + ... + 16753.

It is an arithmetic number, because the mean of its divisors is an integer number (2211840).

Almost surely, 2^20609806 is an apocalyptic number.

20609806 is a deficient number, since it is larger than the sum of its proper divisors (14779634).

20609806 is a wasteful number, since it uses less digits than its factorization.

20609806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2439.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 20609806 is about 4539.8024186081. The cubic root of 20609806 is about 274.1729687343.

The spelling of 20609806 in words is "twenty million, six hundred nine thousand, eight hundred six".