20500671 has 8 divisors (see below), whose sum is σ = 27797760. Its totient is φ = 13435352.

The previous prime is 20500643. The next prime is 20500679. The reversal of 20500671 is 17600502.

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 20500671 - 2⁹ = 20500159 is a prime.

It is a super-2 number, since 2×20500671² = 840555022900482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20500679) 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, 57735 + ... + 58088.

It is an arithmetic number, because the mean of its divisors is an integer number (3474720).

Almost surely, 2^20500671 is an apocalyptic number.

20500671 is a deficient number, since it is larger than the sum of its proper divisors (7297089).

20500671 is a wasteful number, since it uses less digits than its factorization.

20500671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115885.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 20500671 is about 4527.7666680164. The cubic root of 20500671 is about 273.6881697685.

The spelling of 20500671 in words is "twenty million, five hundred thousand, six hundred seventy-one".