20401442243 has 16 divisors (see below), whose sum is σ = 25148711616. Its totient is φ = 16116572160.

The previous prime is 20401442213. The next prime is 20401442249. The reversal of 20401442243 is 34224410402.

It is a happy number.

It is not a de Polignac number, because 20401442243 - 2¹⁰ = 20401441219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20401442249) 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 15 ways as a sum of consecutive naturals, for example, 116546 + ... + 233207.

It is an arithmetic number, because the mean of its divisors is an integer number (1571794476).

Almost surely, 2^20401442243 is an apocalyptic number.

20401442243 is a deficient number, since it is larger than the sum of its proper divisors (4747269373).

20401442243 is a wasteful number, since it uses less digits than its factorization.

20401442243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350414.

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 20401442243 its reverse (34224410402), we get a palindrome (54625852645).

The spelling of 20401442243 in words is "twenty billion, four hundred one million, four hundred forty-two thousand, two hundred forty-three".