20000999993 has 16 divisors (see below), whose sum is σ = 21830634000. Its totient is φ = 18213888000.

The previous prime is 20000999981. The next prime is 20000999999. The reversal of 20000999993 is 39999900002.

It can be written as a sum of positive squares in 8 ways, for example, as 538796944 + 19462203049 = 23212^2 + 139507^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000999993 - 2¹² = 20000995897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20000999999) 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, 500243 + ... + 538743.

It is an arithmetic number, because the mean of its divisors is an integer number (1364414625).

Almost surely, 2^20000999993 is an apocalyptic number.

It is an amenable number.

20000999993 is a deficient number, since it is larger than the sum of its proper divisors (1829634007).

20000999993 is a wasteful number, since it uses less digits than its factorization.

20000999993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39052.

The product of its (nonzero) digits is 354294, while the sum is 50.

The spelling of 20000999993 in words is "twenty billion, nine hundred ninety-nine thousand, nine hundred ninety-three".