20434643401 has 4 divisors (see below), whose sum is σ = 20548803600. Its totient is φ = 20320483204.

The previous prime is 20434643387. The next prime is 20434643407. The reversal of 20434643401 is 10434643402.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20434643401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20434643407) 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, 57079831 + ... + 57080188.

It is an arithmetic number, because the mean of its divisors is an integer number (5137200900).

Almost surely, 2^20434643401 is an apocalyptic number.

It is an amenable number.

20434643401 is a deficient number, since it is larger than the sum of its proper divisors (114160199).

20434643401 is a wasteful number, since it uses less digits than its factorization.

20434643401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114160198.

The product of its (nonzero) digits is 27648, while the sum is 31.

Subtracting from 20434643401 its reverse (10434643402), we obtain a palindrome (9999999999).

The spelling of 20434643401 in words is "twenty billion, four hundred thirty-four million, six hundred forty-three thousand, four hundred one".