20372335012581 has 4 divisors (see below), whose sum is σ = 27163113350112. Its totient is φ = 13581556675052.

The previous prime is 20372335012559. The next prime is 20372335012609. The reversal of 20372335012581 is 18521053327302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20372335012581 - 2⁶ = 20372335012517 is a prime.

It is a super-2 number, since 2×20372335012581² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20372335012541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3395389168761 + ... + 3395389168766.

It is an arithmetic number, because the mean of its divisors is an integer number (6790778337528).

Almost surely, 2^{20372335012581} is an apocalyptic number.

It is an amenable number.

20372335012581 is a deficient number, since it is larger than the sum of its proper divisors (6790778337531).

20372335012581 is an equidigital number, since it uses as much as digits as its factorization.

20372335012581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6790778337530.

The product of its (nonzero) digits is 302400, while the sum is 42.

Adding to 20372335012581 its reverse (18521053327302), we get a palindrome (38893388339883).

The spelling of 20372335012581 in words is "twenty trillion, three hundred seventy-two billion, three hundred thirty-five million, twelve thousand, five hundred eighty-one".