20311979950139 has 2 divisors, whose sum is σ = 20311979950140. Its totient is φ = 20311979950138.

The previous prime is 20311979950027. The next prime is 20311979950189. The reversal of 20311979950139 is 93105997911302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20311979950139 - 2¹² = 20311979946043 is a prime.

It is a super-2 number, since 2×20311979950139² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20311979950189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155989975069 + 10155989975070.

It is an arithmetic number, because the mean of its divisors is an integer number (10155989975070).

Almost surely, 2^{20311979950139} is an apocalyptic number.

20311979950139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311979950139 is an equidigital number, since it uses as much as digits as its factorization.

20311979950139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4133430, while the sum is 59.

The spelling of 20311979950139 in words is "twenty trillion, three hundred eleven billion, nine hundred seventy-nine million, nine hundred fifty thousand, one hundred thirty-nine".