20973847 has 2 divisors, whose sum is σ = 20973848. Its totient is φ = 20973846.

The previous prime is 20973833. The next prime is 20973859. The reversal of 20973847 is 74837902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20973847 - 2¹¹ = 20971799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20973877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10486923 + 10486924.

It is an arithmetic number, because the mean of its divisors is an integer number (10486924).

Almost surely, 2^20973847 is an apocalyptic number.

20973847 is a deficient number, since it is larger than the sum of its proper divisors (1).

20973847 is an equidigital number, since it uses as much as digits as its factorization.

20973847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 20973847 is about 4579.7212797287. The cubic root of 20973847 is about 275.7778396733. Note that the first 3 decimals are identical.

The spelling of 20973847 in words is "twenty million, nine hundred seventy-three thousand, eight hundred forty-seven".