20032021997 has 4 divisors (see below), whose sum is σ = 21572946780. Its totient is φ = 18491097216.

The previous prime is 20032021969. The next prime is 20032022047. The reversal of 20032021997 is 79912023002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2318807716 + 17713214281 = 48154^2 + 133091^2 .

It is a cyclic number.

It is not a de Polignac number, because 20032021997 - 2¹⁴ = 20032005613 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 (20032021937) 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, 770462372 + ... + 770462397.

It is an arithmetic number, because the mean of its divisors is an integer number (5393236695).

Almost surely, 2^20032021997 is an apocalyptic number.

It is an amenable number.

20032021997 is a deficient number, since it is larger than the sum of its proper divisors (1540924783).

20032021997 is a wasteful number, since it uses less digits than its factorization.

20032021997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540924782.

The product of its (nonzero) digits is 13608, while the sum is 35.

Adding to 20032021997 its reverse (79912023002), we get a palindrome (99944044999).

The spelling of 20032021997 in words is "twenty billion, thirty-two million, twenty-one thousand, nine hundred ninety-seven".