20611906 has 8 divisors (see below), whose sum is σ = 35334720. Its totient is φ = 8833668.

The previous prime is 20611901. The next prime is 20611907. The reversal of 20611906 is 60911602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20611901) 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, 736126 + ... + 736153.

It is an arithmetic number, because the mean of its divisors is an integer number (4416840).

Almost surely, 2^20611906 is an apocalyptic number.

20611906 is a deficient number, since it is larger than the sum of its proper divisors (14722814).

20611906 is a wasteful number, since it uses less digits than its factorization.

20611906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472288.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 20611906 is about 4540.0337003155. The cubic root of 20611906 is about 274.1822805424.

The spelling of 20611906 in words is "twenty million, six hundred eleven thousand, nine hundred six".