20434643403 has 8 divisors (see below), whose sum is σ = 27250602816. Its totient is φ = 13620889800.

The previous prime is 20434643387. The next prime is 20434643407. The reversal of 20434643403 is 30434643402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20434643403 - 2⁴ = 20434643387 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 529713 + ... + 566978.

It is an arithmetic number, because the mean of its divisors is an integer number (3406325352).

Almost surely, 2^20434643403 is an apocalyptic number.

20434643403 is a deficient number, since it is larger than the sum of its proper divisors (6815959413).

20434643403 is a wasteful number, since it uses less digits than its factorization.

20434643403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102905.

The product of its (nonzero) digits is 82944, while the sum is 33.

Subtracting 20434643403 from its reverse (30434643402), we obtain a palindrome (9999999999).

The spelling of 20434643403 in words is "twenty billion, four hundred thirty-four million, six hundred forty-three thousand, four hundred three".