20319154747 has 2 divisors, whose sum is σ = 20319154748. Its totient is φ = 20319154746.

The previous prime is 20319154729. The next prime is 20319154771. The reversal of 20319154747 is 74745191302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20319154747 - 2²³ = 20310766139 is a prime.

It is not a weakly prime, because it can be changed into another prime (20319154147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10159577373 + 10159577374.

It is an arithmetic number, because the mean of its divisors is an integer number (10159577374).

Almost surely, 2^20319154747 is an apocalyptic number.

20319154747 is a deficient number, since it is larger than the sum of its proper divisors (1).

20319154747 is an equidigital number, since it uses as much as digits as its factorization.

20319154747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 20319154747 in words is "twenty billion, three hundred nineteen million, one hundred fifty-four thousand, seven hundred forty-seven".