20671461 has 12 divisors (see below), whose sum is σ = 30888780. Its totient is φ = 13305600.

The previous prime is 20671423. The next prime is 20671471. The reversal of 20671461 is 16417602.

It can be written as a sum of positive squares in 2 ways, for example, as 14516100 + 6155361 = 3810^2 + 2481^2 .

It is not a de Polignac number, because 20671461 - 2⁶ = 20671397 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20671471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39340 + ... + 39861.

It is an arithmetic number, because the mean of its divisors is an integer number (2574065).

Almost surely, 2^20671461 is an apocalyptic number.

It is an amenable number.

20671461 is a deficient number, since it is larger than the sum of its proper divisors (10217319).

20671461 is a wasteful number, since it uses less digits than its factorization.

20671461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79236 (or 79233 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20671461 is about 4546.5878414477. The cubic root of 20671461 is about 274.4460960973.

The spelling of 20671461 in words is "twenty million, six hundred seventy-one thousand, four hundred sixty-one".