20777538043 has 2 divisors, whose sum is σ = 20777538044. Its totient is φ = 20777538042.

The previous prime is 20777538013. The next prime is 20777538059. The reversal of 20777538043 is 34083577702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20777538043 - 2⁵ = 20777538011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20777537984 and 20777538002.

It is not a weakly prime, because it can be changed into another prime (20777538013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10388769021 + 10388769022.

It is an arithmetic number, because the mean of its divisors is an integer number (10388769022).

Almost surely, 2^20777538043 is an apocalyptic number.

20777538043 is a deficient number, since it is larger than the sum of its proper divisors (1).

20777538043 is an equidigital number, since it uses as much as digits as its factorization.

20777538043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 987840, while the sum is 46.

The spelling of 20777538043 in words is "twenty billion, seven hundred seventy-seven million, five hundred thirty-eight thousand, forty-three".