20731146 has 16 divisors (see below), whose sum is σ = 41844000. Its totient is φ = 6846768.

The previous prime is 20731133. The next prime is 20731153. The reversal of 20731146 is 64113702.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15196 + ... + 16503.

It is an arithmetic number, because the mean of its divisors is an integer number (2615250).

Almost surely, 2^20731146 is an apocalyptic number.

20731146 is an abundant number, since it is smaller than the sum of its proper divisors (21112854).

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

20731146 is a wasteful number, since it uses less digits than its factorization.

20731146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31813.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 20731146 is about 4553.1468239010. The cubic root of 20731146 is about 274.7099796459.

Adding to 20731146 its reverse (64113702), we get a palindrome (84844848).

The spelling of 20731146 in words is "twenty million, seven hundred thirty-one thousand, one hundred forty-six".