20772947 has 16 divisors (see below), whose sum is σ = 24195360. Its totient is φ = 17667072.

The previous prime is 20772923. The next prime is 20772949. The reversal of 20772947 is 74927702.

It is a cyclic number.

It is not a de Polignac number, because 20772947 - 2¹⁰ = 20771923 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 20772947.

It is not an unprimeable number, because it can be changed into a prime (20772949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8003 + ... + 10275.

It is an arithmetic number, because the mean of its divisors is an integer number (1512210).

Almost surely, 2^20772947 is an apocalyptic number.

20772947 is a deficient number, since it is larger than the sum of its proper divisors (3422413).

20772947 is a wasteful number, since it uses less digits than its factorization.

20772947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2342.

The product of its (nonzero) digits is 49392, while the sum is 38.

The square root of 20772947 is about 4557.7348540695. The cubic root of 20772947 is about 274.8944917566.

The spelling of 20772947 in words is "twenty million, seven hundred seventy-two thousand, nine hundred forty-seven".