20660471 has 8 divisors (see below), whose sum is σ = 22308720. Its totient is φ = 19020672.

The previous prime is 20660399. The next prime is 20660473. The reversal of 20660471 is 17406602.

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

It is a cyclic number.

It is not a de Polignac number, because 20660471 - 2¹⁸ = 20398327 is a prime.

It is a super-3 number, since 3×20660471³ (a number of 23 digits) contains 333 as substring.

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 20660471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20660473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3551 + ... + 7343.

It is an arithmetic number, because the mean of its divisors is an integer number (2788590).

Almost surely, 2^20660471 is an apocalyptic number.

20660471 is a deficient number, since it is larger than the sum of its proper divisors (1648249).

20660471 is a wasteful number, since it uses less digits than its factorization.

20660471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4225.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20660471 is about 4545.3790821009. The cubic root of 20660471 is about 274.3974509746.

The spelling of 20660471 in words is "twenty million, six hundred sixty thousand, four hundred seventy-one".