20747693 has 6 divisors (see below), whose sum is σ = 20893194. Its totient is φ = 20603136.

The previous prime is 20747663. The next prime is 20747719. The reversal of 20747693 is 39674702.

It can be written as a sum of positive squares in 3 ways, for example, as 299209 + 20448484 = 547^2 + 4522^2 .

It is not a de Polignac number, because 20747693 - 2⁸ = 20747437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20747603) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36971 + ... + 37527.

It is an arithmetic number, because the mean of its divisors is an integer number (3482199).

Almost surely, 2^20747693 is an apocalyptic number.

It is an amenable number.

20747693 is a deficient number, since it is larger than the sum of its proper divisors (145501).

20747693 is an frugal number, since it uses more digits than its factorization.

20747693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 20747693 is about 4554.9635563855. The cubic root of 20747693 is about 274.7830487239.

The spelling of 20747693 in words is "twenty million, seven hundred forty-seven thousand, six hundred ninety-three".