20947185 has 24 divisors (see below), whose sum is σ = 41496000. Its totient is φ = 9575712.

The previous prime is 20947169. The next prime is 20947189. The reversal of 20947185 is 58174902.

It is not a de Polignac number, because 20947185 - 2⁴ = 20947169 is a prime.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (20947189) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32935 + ... + 33564.

It is an arithmetic number, because the mean of its divisors is an integer number (1729000).

Almost surely, 2^20947185 is an apocalyptic number.

It is an amenable number.

20947185 is a deficient number, since it is larger than the sum of its proper divisors (20548815).

20947185 is a wasteful number, since it uses less digits than its factorization.

20947185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66517 (or 66514 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 20947185 is about 4576.8094782283. The cubic root of 20947185 is about 275.6609336587.

The spelling of 20947185 in words is "twenty million, nine hundred forty-seven thousand, one hundred eighty-five".