20399841 has 24 divisors (see below), whose sum is σ = 36738624. Its totient is φ = 10596960.

The previous prime is 20399831. The next prime is 20399851. The reversal of 20399841 is 14899302.

It is an interprime number because it is at equal distance from previous prime (20399831) and next prime (20399851).

It is not a de Polignac number, because 20399841 - 2¹⁰ = 20398817 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20399796 and 20399805.

It is not an unprimeable number, because it can be changed into a prime (20399831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14026 + ... + 15411.

It is an arithmetic number, because the mean of its divisors is an integer number (1530776).

Almost surely, 2^20399841 is an apocalyptic number.

20399841 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20399841 is a deficient number, since it is larger than the sum of its proper divisors (16338783).

20399841 is a wasteful number, since it uses less digits than its factorization.

20399841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29461 (or 29458 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 20399841 is about 4516.6183146243. The cubic root of 20399841 is about 273.2387317208.

The spelling of 20399841 in words is "twenty million, three hundred ninety-nine thousand, eight hundred forty-one".