20507891323 has 8 divisors (see below), whose sum is σ = 20710007136. Its totient is φ = 20305833600.

The previous prime is 20507891317. The next prime is 20507891347. The reversal of 20507891323 is 32319870502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20507891323 - 2¹³ = 20507883131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20507891353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1151043 + ... + 1168723.

It is an arithmetic number, because the mean of its divisors is an integer number (2588750892).

Almost surely, 2^20507891323 is an apocalyptic number.

20507891323 is a deficient number, since it is larger than the sum of its proper divisors (202115813).

20507891323 is a wasteful number, since it uses less digits than its factorization.

20507891323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29045.

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 20507891323 in words is "twenty billion, five hundred seven million, eight hundred ninety-one thousand, three hundred twenty-three".