20406633373 has 4 divisors (see below), whose sum is σ = 23321866720. Its totient is φ = 17491400028.

The previous prime is 20406633343. The next prime is 20406633389. The reversal of 20406633373 is 37333660402.

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 not a de Polignac number, because 20406633373 - 2²⁵ = 20373078941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20406633343) 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, 1457616663 + ... + 1457616676.

It is an arithmetic number, because the mean of its divisors is an integer number (5830466680).

Almost surely, 2^20406633373 is an apocalyptic number.

It is an amenable number.

20406633373 is a deficient number, since it is larger than the sum of its proper divisors (2915233347).

20406633373 is an equidigital number, since it uses as much as digits as its factorization.

20406633373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2915233346.

The product of its (nonzero) digits is 163296, while the sum is 37.

The spelling of 20406633373 in words is "twenty billion, four hundred six million, six hundred thirty-three thousand, three hundred seventy-three".