20749419217 has 2 divisors, whose sum is σ = 20749419218. Its totient is φ = 20749419216.

The previous prime is 20749419161. The next prime is 20749419263. The reversal of 20749419217 is 71291494702.

It is a happy number.

It is an a-pointer prime, because the next prime (20749419263) can be obtained adding 20749419217 to its sum of digits (46).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13857762961 + 6891656256 = 117719^2 + 83016^2 .

It is a cyclic number.

It is not a de Polignac number, because 20749419217 - 2²⁷ = 20615201489 is a prime.

It is not a weakly prime, because it can be changed into another prime (20749417217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10374709608 + 10374709609.

It is an arithmetic number, because the mean of its divisors is an integer number (10374709609).

Almost surely, 2^20749419217 is an apocalyptic number.

It is an amenable number.

20749419217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20749419217 is an equidigital number, since it uses as much as digits as its factorization.

20749419217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 46.

The spelling of 20749419217 in words is "twenty billion, seven hundred forty-nine million, four hundred nineteen thousand, two hundred seventeen".