20421603435734 has 16 divisors (see below), whose sum is σ = 30701287868928. Its totient is φ = 10187856485352.

The previous prime is 20421603435697. The next prime is 20421603435781. The reversal of 20421603435734 is 43753430612402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1309682 + ... + 6523685.

It is an arithmetic number, because the mean of its divisors is an integer number (1918830491808).

Almost surely, 2^{20421603435734} is an apocalyptic number.

20421603435734 is a deficient number, since it is larger than the sum of its proper divisors (10279684433194).

20421603435734 is a wasteful number, since it uses less digits than its factorization.

20421603435734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7836299.

The product of its (nonzero) digits is 1451520, while the sum is 44.

The spelling of 20421603435734 in words is "twenty trillion, four hundred twenty-one billion, six hundred three million, four hundred thirty-five thousand, seven hundred thirty-four".