20427269789 has 2 divisors, whose sum is σ = 20427269790. Its totient is φ = 20427269788.

The previous prime is 20427269761. The next prime is 20427269809. The reversal of 20427269789 is 98796272402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19558022500 + 869247289 = 139850^2 + 29483^2 .

It is a cyclic number.

It is not a de Polignac number, because 20427269789 - 2¹⁶ = 20427204253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20427229789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10213634894 + 10213634895.

It is an arithmetic number, because the mean of its divisors is an integer number (10213634895).

Almost surely, 2^20427269789 is an apocalyptic number.

It is an amenable number.

20427269789 is a deficient number, since it is larger than the sum of its proper divisors (1).

20427269789 is an equidigital number, since it uses as much as digits as its factorization.

20427269789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6096384, while the sum is 56.

The spelling of 20427269789 in words is "twenty billion, four hundred twenty-seven million, two hundred sixty-nine thousand, seven hundred eighty-nine".