20917146 has 16 divisors (see below), whose sum is σ = 42364800. Its totient is φ = 6883968.

The previous prime is 20917133. The next prime is 20917153. The reversal of 20917146 is 64171902.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21591 + ... + 22538.

It is an arithmetic number, because the mean of its divisors is an integer number (2647800).

Almost surely, 2^20917146 is an apocalyptic number.

20917146 is an abundant number, since it is smaller than the sum of its proper divisors (21447654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20917146 is a wasteful number, since it uses less digits than its factorization.

20917146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44213.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 20917146 is about 4573.5266480037. The cubic root of 20917146 is about 275.5291014633.

The spelling of 20917146 in words is "twenty million, nine hundred seventeen thousand, one hundred forty-six".