20731371 has 8 divisors (see below), whose sum is σ = 28230144. Its totient is φ = 13526760.

The previous prime is 20731351. The next prime is 20731391. The reversal of 20731371 is 17313702.

It is an interprime number because it is at equal distance from previous prime (20731351) and next prime (20731391).

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

It is not a de Polignac number, because 20731371 - 2⁵ = 20731339 is a prime.

It is a super-3 number, since 3×20731371³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20731301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73375 + ... + 73656.

It is an arithmetic number, because the mean of its divisors is an integer number (3528768).

Almost surely, 2^20731371 is an apocalyptic number.

20731371 is a deficient number, since it is larger than the sum of its proper divisors (7498773).

20731371 is a wasteful number, since it uses less digits than its factorization.

20731371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147081.

The product of its (nonzero) digits is 882, while the sum is 24.

The square root of 20731371 is about 4553.1715320203. The cubic root of 20731371 is about 274.7109734729.

The spelling of 20731371 in words is "twenty million, seven hundred thirty-one thousand, three hundred seventy-one".