20771623 has 4 divisors (see below), whose sum is σ = 21254728. Its totient is φ = 20288520.

The previous prime is 20771593. The next prime is 20771629. The reversal of 20771623 is 32617702.

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 20771623 - 2⁹ = 20771111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20771591 and 20771600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20771629) 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, 241488 + ... + 241573.

It is an arithmetic number, because the mean of its divisors is an integer number (5313682).

Almost surely, 2^20771623 is an apocalyptic number.

20771623 is a deficient number, since it is larger than the sum of its proper divisors (483105).

20771623 is an equidigital number, since it uses as much as digits as its factorization.

20771623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483104.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 20771623 is about 4557.5896041658. The cubic root of 20771623 is about 274.8886513393. Note that the first 3 decimals are identical.

The spelling of 20771623 in words is "twenty million, seven hundred seventy-one thousand, six hundred twenty-three".