20020021000993 has 16 divisors (see below), whose sum is σ = 21610678234320. Its totient is φ = 18436603705344.

The previous prime is 20020021000981. The next prime is 20020021001039. The reversal of 20020021000993 is 39900012002002.

It can be written as a sum of positive squares in 8 ways, for example, as 3935172810529 + 16084848190464 = 1983727^2 + 4010592^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020021000993 - 2¹³ = 20020020992801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20020021000913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182488005 + ... + 182597677.

It is an arithmetic number, because the mean of its divisors is an integer number (1350667389645).

Almost surely, 2^{20020021000993} is an apocalyptic number.

It is an amenable number.

20020021000993 is a deficient number, since it is larger than the sum of its proper divisors (1590657233327).

20020021000993 is a wasteful number, since it uses less digits than its factorization.

20020021000993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142548.

The product of its (nonzero) digits is 1944, while the sum is 28.

Adding to 20020021000993 its reverse (39900012002002), we get a palindrome (59920033002995).

The spelling of 20020021000993 in words is "twenty trillion, twenty billion, twenty-one million, nine hundred ninety-three", and thus it is an aban number.