20731346 has 8 divisors (see below), whose sum is σ = 32169420. Its totient is φ = 10008208.

The previous prime is 20731339. The next prime is 20731351. The reversal of 20731346 is 64313702.

It can be written as a sum of positive squares in 2 ways, for example, as 18879025 + 1852321 = 4345^2 + 1361^2 .

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

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, 178661 + ... + 178776.

Almost surely, 2^20731346 is an apocalyptic number.

20731346 is a deficient number, since it is larger than the sum of its proper divisors (11438074).

20731346 is a wasteful number, since it uses less digits than its factorization.

20731346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357468.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 20731346 is about 4553.1687866803. The cubic root of 20731346 is about 274.7108630480.

The spelling of 20731346 in words is "twenty million, seven hundred thirty-one thousand, three hundred forty-six".