20746171 has 4 divisors (see below), whose sum is σ = 21966552. Its totient is φ = 19525792.

The previous prime is 20746147. The next prime is 20746177. The reversal of 20746171 is 17164702.

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

It is a de Polignac number, because none of the positive numbers 2^k-20746171 is a prime.

It is a super-2 number, since 2×20746171² = 860807222322482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20746177) 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, 610165 + ... + 610198.

It is an arithmetic number, because the mean of its divisors is an integer number (5491638).

Almost surely, 2^20746171 is an apocalyptic number.

20746171 is a deficient number, since it is larger than the sum of its proper divisors (1220381).

20746171 is a wasteful number, since it uses less digits than its factorization.

20746171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220380.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 20746171 is about 4554.7964828299. The cubic root of 20746171 is about 274.7763294222.

The spelling of 20746171 in words is "twenty million, seven hundred forty-six thousand, one hundred seventy-one".