20550671 has 4 divisors (see below), whose sum is σ = 21759552. Its totient is φ = 19341792.

The previous prime is 20550667. The next prime is 20550701. The reversal of 20550671 is 17605502.

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 20550671 - 2² = 20550667 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20550671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550071) 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, 604415 + ... + 604448.

It is an arithmetic number, because the mean of its divisors is an integer number (5439888).

Almost surely, 2^20550671 is an apocalyptic number.

20550671 is a deficient number, since it is larger than the sum of its proper divisors (1208881).

20550671 is a wasteful number, since it uses less digits than its factorization.

20550671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208880.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 20550671 is about 4533.2847914068. The cubic root of 20550671 is about 273.9104925462.

The spelling of 20550671 in words is "twenty million, five hundred fifty thousand, six hundred seventy-one".