20513419643 has 2 divisors, whose sum is σ = 20513419644. Its totient is φ = 20513419642.

The previous prime is 20513419621. The next prime is 20513419657. The reversal of 20513419643 is 34691431502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20513419643 - 2¹² = 20513415547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20513419597 and 20513419606.

It is not a weakly prime, because it can be changed into another prime (20513419243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10256709821 + 10256709822.

It is an arithmetic number, because the mean of its divisors is an integer number (10256709822).

Almost surely, 2^20513419643 is an apocalyptic number.

20513419643 is a deficient number, since it is larger than the sum of its proper divisors (1).

20513419643 is an equidigital number, since it uses as much as digits as its factorization.

20513419643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 20513419643 in words is "twenty billion, five hundred thirteen million, four hundred nineteen thousand, six hundred forty-three".