20409789487 has 2 divisors, whose sum is σ = 20409789488. Its totient is φ = 20409789486.

The previous prime is 20409789469. The next prime is 20409789539. The reversal of 20409789487 is 78498790402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20409789487 - 2⁷ = 20409789359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20409789437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10204894743 + 10204894744.

It is an arithmetic number, because the mean of its divisors is an integer number (10204894744).

Almost surely, 2^20409789487 is an apocalyptic number.

20409789487 is a deficient number, since it is larger than the sum of its proper divisors (1).

20409789487 is an equidigital number, since it uses as much as digits as its factorization.

20409789487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8128512, while the sum is 58.

The spelling of 20409789487 in words is "twenty billion, four hundred nine million, seven hundred eighty-nine thousand, four hundred eighty-seven".