20477671 has 4 divisors (see below), whose sum is σ = 20565792. Its totient is φ = 20389552.

The previous prime is 20477647. The next prime is 20477693. The reversal of 20477671 is 17677402.

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

It is a cyclic number.

It is not a de Polignac number, because 20477671 - 2¹⁹ = 19953383 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 (20477641) 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, 43711 + ... + 44176.

It is an arithmetic number, because the mean of its divisors is an integer number (5141448).

Almost surely, 2^20477671 is an apocalyptic number.

20477671 is a deficient number, since it is larger than the sum of its proper divisors (88121).

20477671 is an equidigital number, since it uses as much as digits as its factorization.

20477671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88120.

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

The square root of 20477671 is about 4525.2260717007. The cubic root of 20477671 is about 273.5857798929.

The spelling of 20477671 in words is "twenty million, four hundred seventy-seven thousand, six hundred seventy-one".