20613004787 has 2 divisors, whose sum is σ = 20613004788. Its totient is φ = 20613004786.

The previous prime is 20613004759. The next prime is 20613004831. The reversal of 20613004787 is 78740031602.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20613004787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20613004787.

It is not a weakly prime, because it can be changed into another prime (20613004757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10306502393 + 10306502394.

It is an arithmetic number, because the mean of its divisors is an integer number (10306502394).

Almost surely, 2^20613004787 is an apocalyptic number.

20613004787 is a deficient number, since it is larger than the sum of its proper divisors (1).

20613004787 is an equidigital number, since it uses as much as digits as its factorization.

20613004787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 38.

The spelling of 20613004787 in words is "twenty billion, six hundred thirteen million, four thousand, seven hundred eighty-seven".