20731364 has 24 divisors (see below), whose sum is σ = 38780280. Its totient is φ = 9662976.

The previous prime is 20731351. The next prime is 20731391. The reversal of 20731364 is 46313702.

It can be written as a sum of positive squares in 4 ways, for example, as 9972964 + 10758400 = 3158^2 + 3280^2 .

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 7 ways as a sum of consecutive naturals, for example, 6014 + ... + 8810.

It is an arithmetic number, because the mean of its divisors is an integer number (1615845).

Almost surely, 2^20731364 is an apocalyptic number.

It is an amenable number.

20731364 is a deficient number, since it is larger than the sum of its proper divisors (18048916).

20731364 is a wasteful number, since it uses less digits than its factorization.

20731364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2927 (or 2925 counting only the distinct ones).

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

The square root of 20731364 is about 4553.1707633253. The cubic root of 20731364 is about 274.7109425540.

The spelling of 20731364 in words is "twenty million, seven hundred thirty-one thousand, three hundred sixty-four".