20731190 has 8 divisors (see below), whose sum is σ = 37316160. Its totient is φ = 8292472.

The previous prime is 20731189. The next prime is 20731231. The reversal of 20731190 is 9113702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20731190² = 859564477632200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1036550 + ... + 1036569.

It is an arithmetic number, because the mean of its divisors is an integer number (4664520).

Almost surely, 2^20731190 is an apocalyptic number.

20731190 is a deficient number, since it is larger than the sum of its proper divisors (16584970).

20731190 is a wasteful number, since it uses less digits than its factorization.

20731190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2073126.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 20731190 is about 4553.1516557216. The cubic root of 20731190 is about 274.7101739948.

Adding to 20731190 its reverse (9113702), we get a palindrome (29844892).

The spelling of 20731190 in words is "twenty million, seven hundred thirty-one thousand, one hundred ninety".