20154424517 has 2 divisors, whose sum is σ = 20154424518. Its totient is φ = 20154424516.

The previous prime is 20154424513. The next prime is 20154424519. The reversal of 20154424517 is 71542445102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19944783076 + 209641441 = 141226^2 + 14479^2 .

It is a cyclic number.

It is not a de Polignac number, because 20154424517 - 2² = 20154424513 is a prime.

It is a super-2 number, since 2×20154424517² (a number of 21 digits) contains 22 as substring.

Together with 20154424519, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20154424513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10077212258 + 10077212259.

It is an arithmetic number, because the mean of its divisors is an integer number (10077212259).

Almost surely, 2^20154424517 is an apocalyptic number.

It is an amenable number.

20154424517 is a deficient number, since it is larger than the sum of its proper divisors (1).

20154424517 is an equidigital number, since it uses as much as digits as its factorization.

20154424517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 44800, while the sum is 35.

Adding to 20154424517 its reverse (71542445102), we get a palindrome (91696869619).

The spelling of 20154424517 in words is "twenty billion, one hundred fifty-four million, four hundred twenty-four thousand, five hundred seventeen".