20682471 has 4 divisors (see below), whose sum is σ = 27576632. Its totient is φ = 13788312.

The previous prime is 20682463. The next prime is 20682499. The reversal of 20682471 is 17428602.

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

It is not a de Polignac number, because 20682471 - 2³ = 20682463 is a prime.

It is a super-3 number, since 3×20682471³ (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 (20682461) 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, 3447076 + ... + 3447081.

It is an arithmetic number, because the mean of its divisors is an integer number (6894158).

Almost surely, 2^20682471 is an apocalyptic number.

20682471 is a deficient number, since it is larger than the sum of its proper divisors (6894161).

20682471 is an equidigital number, since it uses as much as digits as its factorization.

20682471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6894160.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 20682471 is about 4547.7984783849. The cubic root of 20682471 is about 274.4948124607.

The spelling of 20682471 in words is "twenty million, six hundred eighty-two thousand, four hundred seventy-one".