20291780027 has 2 divisors, whose sum is σ = 20291780028. Its totient is φ = 20291780026.

The previous prime is 20291780017. The next prime is 20291780039. The reversal of 20291780027 is 72008719202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20291780027 - 2⁴ = 20291780011 is a prime.

It is a super-2 number, since 2×20291780027² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20291780017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10145890013 + 10145890014.

It is an arithmetic number, because the mean of its divisors is an integer number (10145890014).

Almost surely, 2^20291780027 is an apocalyptic number.

20291780027 is a deficient number, since it is larger than the sum of its proper divisors (1).

20291780027 is an equidigital number, since it uses as much as digits as its factorization.

20291780027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 38.

The spelling of 20291780027 in words is "twenty billion, two hundred ninety-one million, seven hundred eighty thousand, twenty-seven".