20947964 has 6 divisors (see below), whose sum is σ = 36658944. Its totient is φ = 10473980.

The previous prime is 20947939. The next prime is 20947973. The reversal of 20947964 is 46974902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2618492 + ... + 2618499.

It is an arithmetic number, because the mean of its divisors is an integer number (6109824).

Almost surely, 2^20947964 is an apocalyptic number.

It is an amenable number.

20947964 is a deficient number, since it is larger than the sum of its proper divisors (15710980).

20947964 is a wasteful number, since it uses less digits than its factorization.

20947964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5236995 (or 5236993 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 20947964 is about 4576.8945803896. The cubic root of 20947964 is about 275.6643507798.

The spelling of 20947964 in words is "twenty million, nine hundred forty-seven thousand, nine hundred sixty-four".