20402443101 has 4 divisors (see below), whose sum is σ = 27203257472. Its totient is φ = 13601628732.

The previous prime is 20402443057. The next prime is 20402443111. The reversal of 20402443101 is 10134420402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20402443101 - 2⁹ = 20402442589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402443111) 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, 3400407181 + ... + 3400407186.

It is an arithmetic number, because the mean of its divisors is an integer number (6800814368).

Almost surely, 2^20402443101 is an apocalyptic number.

It is an amenable number.

20402443101 is a deficient number, since it is larger than the sum of its proper divisors (6800814371).

20402443101 is an equidigital number, since it uses as much as digits as its factorization.

20402443101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6800814370.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 20402443101 its reverse (10134420402), we get a palindrome (30536863503).

The spelling of 20402443101 in words is "twenty billion, four hundred two million, four hundred forty-three thousand, one hundred one".