20238437993 has 16 divisors (see below), whose sum is σ = 21410077440. Its totient is φ = 19077638400.

The previous prime is 20238437969. The next prime is 20238438083. The reversal of 20238437993 is 39973483202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20238437993 - 2¹⁰ = 20238436969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20238437953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4843121 + ... + 4847297.

It is an arithmetic number, because the mean of its divisors is an integer number (1338129840).

Almost surely, 2^20238437993 is an apocalyptic number.

It is an amenable number.

20238437993 is a deficient number, since it is larger than the sum of its proper divisors (1171639447).

20238437993 is a wasteful number, since it uses less digits than its factorization.

20238437993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5408.

The product of its (nonzero) digits is 1959552, while the sum is 50.

The spelling of 20238437993 in words is "twenty billion, two hundred thirty-eight million, four hundred thirty-seven thousand, nine hundred ninety-three".