20993673 has 4 divisors (see below), whose sum is σ = 27991568. Its totient is φ = 13995780.

The previous prime is 20993669. The next prime is 20993677. The reversal of 20993673 is 37639902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (20993669) and next prime (20993677).

It is not a de Polignac number, because 20993673 - 2² = 20993669 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20993677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3498943 + ... + 3498948.

It is an arithmetic number, because the mean of its divisors is an integer number (6997892).

Almost surely, 2^20993673 is an apocalyptic number.

It is an amenable number.

20993673 is a deficient number, since it is larger than the sum of its proper divisors (6997895).

20993673 is an equidigital number, since it uses as much as digits as its factorization.

20993673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6997894.

The product of its (nonzero) digits is 61236, while the sum is 39.

The square root of 20993673 is about 4581.8853106554. The cubic root of 20993673 is about 275.8647073737.

The spelling of 20993673 in words is "twenty million, nine hundred ninety-three thousand, six hundred seventy-three".