20955747139 has 2 divisors, whose sum is σ = 20955747140. Its totient is φ = 20955747138.

The previous prime is 20955747061. The next prime is 20955747173. The reversal of 20955747139 is 93174755902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20955747139 - 2⁷ = 20955747011 is a prime.

It is not a weakly prime, because it can be changed into another prime (20955741139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10477873569 + 10477873570.

It is an arithmetic number, because the mean of its divisors is an integer number (10477873570).

Almost surely, 2^20955747139 is an apocalyptic number.

20955747139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20955747139 is an equidigital number, since it uses as much as digits as its factorization.

20955747139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2381400, while the sum is 52.

The spelling of 20955747139 in words is "twenty billion, nine hundred fifty-five million, seven hundred forty-seven thousand, one hundred thirty-nine".