20623913971 has 2 divisors, whose sum is σ = 20623913972. Its totient is φ = 20623913970.

The previous prime is 20623913939. The next prime is 20623913977. The reversal of 20623913971 is 17931932602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20623913971 - 2⁵ = 20623913939 is a prime.

It is not a weakly prime, because it can be changed into another prime (20623913977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10311956985 + 10311956986.

It is an arithmetic number, because the mean of its divisors is an integer number (10311956986).

Almost surely, 2^20623913971 is an apocalyptic number.

20623913971 is a deficient number, since it is larger than the sum of its proper divisors (1).

20623913971 is an equidigital number, since it uses as much as digits as its factorization.

20623913971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 43.

The spelling of 20623913971 in words is "twenty billion, six hundred twenty-three million, nine hundred thirteen thousand, nine hundred seventy-one".