20403022021 has 8 divisors (see below), whose sum is σ = 20629474200. Its totient is φ = 20177375232.

The previous prime is 20403021973. The next prime is 20403022063. The reversal of 20403022021 is 12022030402.

It can be written as a sum of positive squares in 4 ways, for example, as 3945724225 + 16457297796 = 62815^2 + 128286^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20403022021 - 2²⁷ = 20268804293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20403021986 and 20403022004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20403022121) 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, 150330 + ... + 251803.

It is an arithmetic number, because the mean of its divisors is an integer number (2578684275).

Almost surely, 2^20403022021 is an apocalyptic number.

It is an amenable number.

20403022021 is a deficient number, since it is larger than the sum of its proper divisors (226452179).

20403022021 is a wasteful number, since it uses less digits than its factorization.

20403022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402695.

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 20403022021 its reverse (12022030402), we get a palindrome (32425052423).

The spelling of 20403022021 in words is "twenty billion, four hundred three million, twenty-two thousand, twenty-one".