20609511 has 16 divisors (see below), whose sum is σ = 30317280. Its totient is φ = 12372480.

The previous prime is 20609507. The next prime is 20609539. The reversal of 20609511 is 11590602.

It is not a de Polignac number, because 20609511 - 2² = 20609507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20609581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4846 + ... + 8043.

It is an arithmetic number, because the mean of its divisors is an integer number (1894830).

Almost surely, 2^20609511 is an apocalyptic number.

20609511 is a deficient number, since it is larger than the sum of its proper divisors (9707769).

20609511 is a wasteful number, since it uses less digits than its factorization.

20609511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12946.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 20609511 is about 4539.7699280911. The cubic root of 20609511 is about 274.1716605962.

The spelling of 20609511 in words is "twenty million, six hundred nine thousand, five hundred eleven".