20473961 has 4 divisors (see below), whose sum is σ = 20544132. Its totient is φ = 20403792.

The previous prime is 20473949. The next prime is 20473993. The reversal of 20473961 is 16937402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9211225 + 11262736 = 3035^2 + 3356^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20473961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20473931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34646 + ... + 35231.

It is an arithmetic number, because the mean of its divisors is an integer number (5136033).

Almost surely, 2^20473961 is an apocalyptic number.

It is an amenable number.

20473961 is a deficient number, since it is larger than the sum of its proper divisors (70171).

20473961 is an equidigital number, since it uses as much as digits as its factorization.

20473961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70170.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 20473961 is about 4524.8161288609. The cubic root of 20473961 is about 273.5692567810.

The spelling of 20473961 in words is "twenty million, four hundred seventy-three thousand, nine hundred sixty-one".