20421435837 has 16 divisors (see below), whose sum is σ = 29949399360. Its totient is φ = 12376625360.

The previous prime is 20421435817. The next prime is 20421435851. The reversal of 20421435837 is 73853412402.

It is not a de Polignac number, because 20421435837 - 2¹⁶ = 20421370301 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20421435795 and 20421435804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421435817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2553162 + ... + 2561147.

It is an arithmetic number, because the mean of its divisors is an integer number (1871837460).

Almost surely, 2^20421435837 is an apocalyptic number.

It is an amenable number.

20421435837 is a deficient number, since it is larger than the sum of its proper divisors (9527963523).

20421435837 is an equidigital number, since it uses as much as digits as its factorization.

20421435837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5114345 (or 5114323 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 39.

The spelling of 20421435837 in words is "twenty billion, four hundred twenty-one million, four hundred thirty-five thousand, eight hundred thirty-seven".