20613893537 has 2 divisors, whose sum is σ = 20613893538. Its totient is φ = 20613893536.

The previous prime is 20613893491. The next prime is 20613893549. The reversal of 20613893537 is 73539831602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12577846801 + 8036046736 = 112151^2 + 89644^2 .

It is a cyclic number.

It is not a de Polignac number, because 20613893537 - 2²⁶ = 20546784673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20613893491 and 20613893500.

It is not a weakly prime, because it can be changed into another prime (20613893737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10306946768 + 10306946769.

It is an arithmetic number, because the mean of its divisors is an integer number (10306946769).

Almost surely, 2^20613893537 is an apocalyptic number.

It is an amenable number.

20613893537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20613893537 is an equidigital number, since it uses as much as digits as its factorization.

20613893537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 47.

The spelling of 20613893537 in words is "twenty billion, six hundred thirteen million, eight hundred ninety-three thousand, five hundred thirty-seven".