20679611 has 4 divisors (see below), whose sum is σ = 20689224. Its totient is φ = 20670000.

The previous prime is 20679587. The next prime is 20679613. The reversal of 20679611 is 11697602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20679611 - 2²² = 16485307 is a prime.

It is a super-2 number, since 2×20679611² = 855292622222642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20679613) 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, 71 + ... + 6431.

It is an arithmetic number, because the mean of its divisors is an integer number (5172306).

Almost surely, 2^20679611 is an apocalyptic number.

20679611 is a deficient number, since it is larger than the sum of its proper divisors (9613).

20679611 is an equidigital number, since it uses as much as digits as its factorization.

20679611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9612.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 20679611 is about 4547.4840296586. The cubic root of 20679611 is about 274.4821593730.

Subtracting from 20679611 its reverse (11697602), we obtain a square (8982009 = 2997²).

The spelling of 20679611 in words is "twenty million, six hundred seventy-nine thousand, six hundred eleven".