20523673889 has 2 divisors, whose sum is σ = 20523673890. Its totient is φ = 20523673888.

The previous prime is 20523673879. The next prime is 20523673903. The reversal of 20523673889 is 98837632502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10661595025 + 9862078864 = 103255^2 + 99308^2 .

It is a cyclic number.

It is not a de Polignac number, because 20523673889 - 2⁴ = 20523673873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20523673889.

It is not a weakly prime, because it can be changed into another prime (20523673879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10261836944 + 10261836945.

It is an arithmetic number, because the mean of its divisors is an integer number (10261836945).

Almost surely, 2^20523673889 is an apocalyptic number.

It is an amenable number.

20523673889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20523673889 is an equidigital number, since it uses as much as digits as its factorization.

20523673889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 20523673889 in words is "twenty billion, five hundred twenty-three million, six hundred seventy-three thousand, eight hundred eighty-nine".