20494671679 has 2 divisors, whose sum is σ = 20494671680. Its totient is φ = 20494671678.

The previous prime is 20494671563. The next prime is 20494671713. The reversal of 20494671679 is 97617649402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20494671679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20494671179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10247335839 + 10247335840.

It is an arithmetic number, because the mean of its divisors is an integer number (10247335840).

Almost surely, 2^20494671679 is an apocalyptic number.

20494671679 is a deficient number, since it is larger than the sum of its proper divisors (1).

20494671679 is an equidigital number, since it uses as much as digits as its factorization.

20494671679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4572288, while the sum is 55.

The spelling of 20494671679 in words is "twenty billion, four hundred ninety-four million, six hundred seventy-one thousand, six hundred seventy-nine".