20744693 has 8 divisors (see below), whose sum is σ = 21051576. Its totient is φ = 20440000.

The previous prime is 20744687. The next prime is 20744699. The reversal of 20744693 is 39644702.

It is an interprime number because it is at equal distance from previous prime (20744687) and next prime (20744699).

It can be written as a sum of positive squares in 4 ways, for example, as 17497489 + 3247204 = 4183^2 + 1802^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20744693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20744699) 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, 29243 + ... + 29943.

It is an arithmetic number, because the mean of its divisors is an integer number (2631447).

Almost surely, 2^20744693 is an apocalyptic number.

It is an amenable number.

20744693 is a deficient number, since it is larger than the sum of its proper divisors (306883).

20744693 is a wasteful number, since it uses less digits than its factorization.

20744693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 20744693 is about 4554.6342333935. The cubic root of 20744693 is about 274.7698040564.

It can be divided in two parts, 207 and 44693, that multiplied together give a triangular number (9251451 = T₄₃₀₁).

The spelling of 20744693 in words is "twenty million, seven hundred forty-four thousand, six hundred ninety-three".