20731036 has 12 divisors (see below), whose sum is σ = 36619128. Its totient is φ = 10268432.

The previous prime is 20731001. The next prime is 20731043. The reversal of 20731036 is 63013702.

It is a junction number, because it is equal to n+sod(n) for n = 20730998 and 20731016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23791 + ... + 24646.

It is an arithmetic number, because the mean of its divisors is an integer number (3051594).

Almost surely, 2^20731036 is an apocalyptic number.

It is an amenable number.

20731036 is a deficient number, since it is larger than the sum of its proper divisors (15888092).

20731036 is a wasteful number, since it uses less digits than its factorization.

20731036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48548 (or 48546 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 20731036 is about 4553.1347443273. The cubic root of 20731036 is about 274.7094937722.

Adding to 20731036 its reverse (63013702), we get a palindrome (83744738).

It can be divided in two parts, 2073 and 1036, that multiplied together give a triangular number (2147628 = T₂₀₇₂).

The spelling of 20731036 in words is "twenty million, seven hundred thirty-one thousand, thirty-six".