20143786417 has 2 divisors, whose sum is σ = 20143786418. Its totient is φ = 20143786416.

The previous prime is 20143786393. The next prime is 20143786451. The reversal of 20143786417 is 71468734102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11363346801 + 8780439616 = 106599^2 + 93704^2 .

It is a cyclic number.

It is not a de Polignac number, because 20143786417 - 2²³ = 20135397809 is a prime.

It is not a weakly prime, because it can be changed into another prime (20143786477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10071893208 + 10071893209.

It is an arithmetic number, because the mean of its divisors is an integer number (10071893209).

Almost surely, 2^20143786417 is an apocalyptic number.

It is an amenable number.

20143786417 is a deficient number, since it is larger than the sum of its proper divisors (1).

20143786417 is an equidigital number, since it uses as much as digits as its factorization.

20143786417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 43.

The spelling of 20143786417 in words is "twenty billion, one hundred forty-three million, seven hundred eighty-six thousand, four hundred seventeen".