20291911139 has 2 divisors, whose sum is σ = 20291911140. Its totient is φ = 20291911138.

The previous prime is 20291911121. The next prime is 20291911151. The reversal of 20291911139 is 93111919202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20291911139 - 2¹⁶ = 20291845603 is a prime.

It is not a weakly prime, because it can be changed into another prime (20291911109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10145955569 + 10145955570.

It is an arithmetic number, because the mean of its divisors is an integer number (10145955570).

Almost surely, 2^20291911139 is an apocalyptic number.

20291911139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20291911139 is an equidigital number, since it uses as much as digits as its factorization.

20291911139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 38.

The spelling of 20291911139 in words is "twenty billion, two hundred ninety-one million, nine hundred eleven thousand, one hundred thirty-nine".