20947384 has 8 divisors (see below), whose sum is σ = 39276360. Its totient is φ = 10473688.

The previous prime is 20947363. The next prime is 20947387. The reversal of 20947384 is 48374902.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20947387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1309204 + ... + 1309219.

It is an arithmetic number, because the mean of its divisors is an integer number (4909545).

Almost surely, 2^20947384 is an apocalyptic number.

It is an amenable number.

20947384 is a deficient number, since it is larger than the sum of its proper divisors (18328976).

20947384 is a wasteful number, since it uses less digits than its factorization.

20947384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2618429 (or 2618425 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 20947384 is about 4576.8312182120. The cubic root of 20947384 is about 275.6618065898.

The spelling of 20947384 in words is "twenty million, nine hundred forty-seven thousand, three hundred eighty-four".