20420087593 has 16 divisors (see below), whose sum is σ = 21229272576. Its totient is φ = 19620558720.

The previous prime is 20420087549. The next prime is 20420087711. The reversal of 20420087593 is 39578002402.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20420087593 is a prime.

It is a super-3 number, since 3×20420087593³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20420387593) 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, 9483405 + ... + 9485557.

It is an arithmetic number, because the mean of its divisors is an integer number (1326829536).

Almost surely, 2^20420087593 is an apocalyptic number.

It is an amenable number.

20420087593 is a deficient number, since it is larger than the sum of its proper divisors (809184983).

20420087593 is a wasteful number, since it uses less digits than its factorization.

20420087593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4224.

The product of its (nonzero) digits is 120960, while the sum is 40.

Adding to 20420087593 its reverse (39578002402), we get a palindrome (59998089995).

The spelling of 20420087593 in words is "twenty billion, four hundred twenty million, eighty-seven thousand, five hundred ninety-three".