20680471 has 4 divisors (see below), whose sum is σ = 23634832. Its totient is φ = 17726112.

The previous prime is 20680453. The next prime is 20680487. The reversal of 20680471 is 17408602.

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 20680471 - 2⁹ = 20679959 is a prime.

It is a super-3 number, since 3×20680471³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20680411) 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, 1477170 + ... + 1477183.

It is an arithmetic number, because the mean of its divisors is an integer number (5908708).

Almost surely, 2^20680471 is an apocalyptic number.

20680471 is a deficient number, since it is larger than the sum of its proper divisors (2954361).

20680471 is an equidigital number, since it uses as much as digits as its factorization.

20680471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2954360.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 20680471 is about 4547.5785864568. The cubic root of 20680471 is about 274.4859642703.

The spelling of 20680471 in words is "twenty million, six hundred eighty thousand, four hundred seventy-one".