20947277 has 8 divisors (see below), whose sum is σ = 22868664. Its totient is φ = 19070208.

The previous prime is 20947271. The next prime is 20947327. The reversal of 20947277 is 77274902.

It can be written as a sum of positive squares in 4 ways, for example, as 5470921 + 15476356 = 2339^2 + 3934^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20947277 - 2⁸ = 20947021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20947277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20947271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10088 + ... + 11985.

It is an arithmetic number, because the mean of its divisors is an integer number (2858583).

Almost surely, 2^20947277 is an apocalyptic number.

It is an amenable number.

20947277 is a deficient number, since it is larger than the sum of its proper divisors (1921387).

20947277 is a wasteful number, since it uses less digits than its factorization.

20947277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22159.

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

The square root of 20947277 is about 4576.8195288868. The cubic root of 20947277 is about 275.6613372255.

The spelling of 20947277 in words is "twenty million, nine hundred forty-seven thousand, two hundred seventy-seven".