20413947 has 4 divisors (see below), whose sum is σ = 27218600. Its totient is φ = 13609296.

The previous prime is 20413931. The next prime is 20413951. The reversal of 20413947 is 74931402.

It is a happy number.

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

It is not a de Polignac number, because 20413947 - 2⁴ = 20413931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20413907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3402322 + ... + 3402327.

It is an arithmetic number, because the mean of its divisors is an integer number (6804650).

Almost surely, 2^20413947 is an apocalyptic number.

20413947 is a deficient number, since it is larger than the sum of its proper divisors (6804653).

20413947 is an equidigital number, since it uses as much as digits as its factorization.

20413947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6804652.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 20413947 is about 4518.1796113036. The cubic root of 20413947 is about 273.3016965499.

The spelling of 20413947 in words is "twenty million, four hundred thirteen thousand, nine hundred forty-seven".