20675611 has 4 divisors (see below), whose sum is σ = 22555224. Its totient is φ = 18796000.

The previous prime is 20675593. The next prime is 20675617. The reversal of 20675611 is 11657602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20675611 - 2⁷ = 20675483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20675611.

It is not an unprimeable number, because it can be changed into a prime (20675617) 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, 939790 + ... + 939811.

It is an arithmetic number, because the mean of its divisors is an integer number (5638806).

Almost surely, 2^20675611 is an apocalyptic number.

20675611 is the 2034-th centered decagonal number.

20675611 is a deficient number, since it is larger than the sum of its proper divisors (1879613).

20675611 is a wasteful number, since it uses less digits than its factorization.

20675611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1879612.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 20675611 is about 4547.0442047554. The cubic root of 20675611 is about 274.4644607900.

Subtracting from 20675611 its reverse (11657602), we obtain a square (9018009 = 3003²).

The spelling of 20675611 in words is "twenty million, six hundred seventy-five thousand, six hundred eleven".