20471677 has 4 divisors (see below), whose sum is σ = 20522140. Its totient is φ = 20421216.

The previous prime is 20471663. The next prime is 20471699. The reversal of 20471677 is 77617402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77617402 = 2 ⋅38808701.

It can be written as a sum of positive squares in 2 ways, for example, as 19412836 + 1058841 = 4406^2 + 1029^2 .

It is a cyclic number.

It is not a de Polignac number, because 20471677 - 2¹⁵ = 20438909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20471777) 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, 24618 + ... + 25435.

It is an arithmetic number, because the mean of its divisors is an integer number (5130535).

Almost surely, 2^20471677 is an apocalyptic number.

It is an amenable number.

20471677 is a deficient number, since it is larger than the sum of its proper divisors (50463).

20471677 is an equidigital number, since it uses as much as digits as its factorization.

20471677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50462.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 20471677 is about 4524.5637358755. The cubic root of 20471677 is about 273.5590836084.

The spelling of 20471677 in words is "twenty million, four hundred seventy-one thousand, six hundred seventy-seven".