20662847 has 2 divisors, whose sum is σ = 20662848. Its totient is φ = 20662846.

The previous prime is 20662801. The next prime is 20662891. The reversal of 20662847 is 74826602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20662847 - 2²⁰ = 19614271 is a prime.

It is a super-2 number, since 2×20662847² = 853906492290818, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20662897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10331423 + 10331424.

It is an arithmetic number, because the mean of its divisors is an integer number (10331424).

Almost surely, 2^20662847 is an apocalyptic number.

20662847 is a deficient number, since it is larger than the sum of its proper divisors (1).

20662847 is an equidigital number, since it uses as much as digits as its factorization.

20662847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 20662847 is about 4545.6404389261. The cubic root of 20662847 is about 274.4079693433.

It can be divided in two parts, 2066 and 2847, that added together give a cube (4913 = 17³).

The spelling of 20662847 in words is "twenty million, six hundred sixty-two thousand, eight hundred forty-seven".