20747644 has 12 divisors (see below), whose sum is σ = 37560600. Its totient is φ = 10016048.

The previous prime is 20747641. The next prime is 20747647. The reversal of 20747644 is 44674702.

It is an interprime number because it is at equal distance from previous prime (20747641) and next prime (20747647).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20747641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89314 + ... + 89545.

It is an arithmetic number, because the mean of its divisors is an integer number (3130050).

Almost surely, 2^20747644 is an apocalyptic number.

It is an amenable number.

20747644 is a deficient number, since it is larger than the sum of its proper divisors (16812956).

20747644 is a wasteful number, since it uses less digits than its factorization.

20747644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178892 (or 178890 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 34.

The square root of 20747644 is about 4554.9581776346. The cubic root of 20747644 is about 274.7828324046.

The spelling of 20747644 in words is "twenty million, seven hundred forty-seven thousand, six hundred forty-four".