20771479 has 4 divisors (see below), whose sum is σ = 20796520. Its totient is φ = 20746440.

The previous prime is 20771449. The next prime is 20771489. The reversal of 20771479 is 97417702.

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 20771479 - 2⁵ = 20771447 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 (20771419) 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, 11232 + ... + 12949.

It is an arithmetic number, because the mean of its divisors is an integer number (5199130).

Almost surely, 2^20771479 is an apocalyptic number.

20771479 is a deficient number, since it is larger than the sum of its proper divisors (25041).

20771479 is an equidigital number, since it uses as much as digits as its factorization.

20771479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25040.

The product of its (nonzero) digits is 24696, while the sum is 37.

The square root of 20771479 is about 4557.5738063141. The cubic root of 20771479 is about 274.8880161128. Note that the first 3 decimals are identical.

The spelling of 20771479 in words is "twenty million, seven hundred seventy-one thousand, four hundred seventy-nine".