20537893723 has 16 divisors (see below), whose sum is σ = 21516042240. Its totient is φ = 19567015776.

The previous prime is 20537893703. The next prime is 20537893729. The reversal of 20537893723 is 32739873502.

It is a cyclic number.

It is not a de Polignac number, because 20537893723 - 2¹³ = 20537885531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20537893729) 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, 7642086 + ... + 7644772.

It is an arithmetic number, because the mean of its divisors is an integer number (1344752640).

Almost surely, 2^20537893723 is an apocalyptic number.

20537893723 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20537893723 is a deficient number, since it is larger than the sum of its proper divisors (978148517).

20537893723 is a wasteful number, since it uses less digits than its factorization.

20537893723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3906.

The product of its (nonzero) digits is 1905120, while the sum is 49.

The spelling of 20537893723 in words is "twenty billion, five hundred thirty-seven million, eight hundred ninety-three thousand, seven hundred twenty-three".