20041399 has 4 divisors (see below), whose sum is σ = 22904464. Its totient is φ = 17178336.

The previous prime is 20041391. The next prime is 20041403. The reversal of 20041399 is 99314002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99314002 = 2 ⋅49657001.

It is not a de Polignac number, because 20041399 - 2³ = 20041391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20041391) 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, 1431522 + ... + 1431535.

It is an arithmetic number, because the mean of its divisors is an integer number (5726116).

Almost surely, 2^20041399 is an apocalyptic number.

20041399 is a deficient number, since it is larger than the sum of its proper divisors (2863065).

20041399 is an equidigital number, since it uses as much as digits as its factorization.

20041399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2863064.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20041399 is about 4476.7621111692. The cubic root of 20041399 is about 271.6289228722.

It can be divided in two parts, 2004 and 1399, that added together give a triangular number (3403 = T₈₂).

The spelling of 20041399 in words is "twenty million, forty-one thousand, three hundred ninety-nine".