20169071 has 4 divisors (see below), whose sum is σ = 21720552. Its totient is φ = 18617592.

The previous prime is 20169047. The next prime is 20169109. The reversal of 20169071 is 17096102.

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 20169071 - 2²² = 15974767 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 20169071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20169271) 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, 775721 + ... + 775746.

It is an arithmetic number, because the mean of its divisors is an integer number (5430138).

Almost surely, 2^20169071 is an apocalyptic number.

20169071 is a deficient number, since it is larger than the sum of its proper divisors (1551481).

20169071 is a wasteful number, since it uses less digits than its factorization.

20169071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551480.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 20169071 is about 4490.9988866621. The cubic root of 20169071 is about 272.2044985700.

The spelling of 20169071 in words is "twenty million, one hundred sixty-nine thousand, seventy-one".