20616354139 has 2 divisors, whose sum is σ = 20616354140. Its totient is φ = 20616354138.

The previous prime is 20616354131. The next prime is 20616354163. The reversal of 20616354139 is 93145361602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20616354139 - 2³ = 20616354131 is a prime.

It is not a weakly prime, because it can be changed into another prime (20616354131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10308177069 + 10308177070.

It is an arithmetic number, because the mean of its divisors is an integer number (10308177070).

Almost surely, 2^20616354139 is an apocalyptic number.

20616354139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20616354139 is an equidigital number, since it uses as much as digits as its factorization.

20616354139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 40.

The spelling of 20616354139 in words is "twenty billion, six hundred sixteen million, three hundred fifty-four thousand, one hundred thirty-nine".