20993047 has 2 divisors, whose sum is σ = 20993048. Its totient is φ = 20993046.

The previous prime is 20993041. The next prime is 20993059. The reversal of 20993047 is 74039902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20993047 - 2³ = 20993039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20993041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10496523 + 10496524.

It is an arithmetic number, because the mean of its divisors is an integer number (10496524).

Almost surely, 2^20993047 is an apocalyptic number.

20993047 is a deficient number, since it is larger than the sum of its proper divisors (1).

20993047 is an equidigital number, since it uses as much as digits as its factorization.

20993047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 20993047 is about 4581.8169976550. The cubic root of 20993047 is about 275.8619653884.

The spelling of 20993047 in words is "twenty million, nine hundred ninety-three thousand, forty-seven".