20455115923 has 4 divisors (see below), whose sum is σ = 22314671928. Its totient is φ = 18595559920.

The previous prime is 20455115917. The next prime is 20455115957. The reversal of 20455115923 is 32951155402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20455115923 - 2¹³ = 20455107731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20455115963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 929777986 + ... + 929778007.

It is an arithmetic number, because the mean of its divisors is an integer number (5578667982).

Almost surely, 2^20455115923 is an apocalyptic number.

20455115923 is a deficient number, since it is larger than the sum of its proper divisors (1859556005).

20455115923 is a wasteful number, since it uses less digits than its factorization.

20455115923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859556004.

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 20455115923 in words is "twenty billion, four hundred fifty-five million, one hundred fifteen thousand, nine hundred twenty-three".