20785408619 has 2 divisors, whose sum is σ = 20785408620. Its totient is φ = 20785408618.

The previous prime is 20785408561. The next prime is 20785408687. The reversal of 20785408619 is 91680458702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20785408619 - 2¹⁶ = 20785343083 is a prime.

It is a super-2 number, since 2×20785408619² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20785428619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10392704309 + 10392704310.

It is an arithmetic number, because the mean of its divisors is an integer number (10392704310).

Almost surely, 2^20785408619 is an apocalyptic number.

20785408619 is a deficient number, since it is larger than the sum of its proper divisors (1).

20785408619 is an equidigital number, since it uses as much as digits as its factorization.

20785408619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 967680, while the sum is 50.

The spelling of 20785408619 in words is "twenty billion, seven hundred eighty-five million, four hundred eight thousand, six hundred nineteen".