20601615787 has 2 divisors, whose sum is σ = 20601615788. Its totient is φ = 20601615786.

The previous prime is 20601615751. The next prime is 20601615829. The reversal of 20601615787 is 78751610602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20601615787 - 2¹⁹ = 20601091499 is a prime.

It is not a weakly prime, because it can be changed into another prime (20601615187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10300807893 + 10300807894.

It is an arithmetic number, because the mean of its divisors is an integer number (10300807894).

Almost surely, 2^20601615787 is an apocalyptic number.

20601615787 is a deficient number, since it is larger than the sum of its proper divisors (1).

20601615787 is an equidigital number, since it uses as much as digits as its factorization.

20601615787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 43.

The spelling of 20601615787 in words is "twenty billion, six hundred one million, six hundred fifteen thousand, seven hundred eighty-seven".