20983993463 has 2 divisors, whose sum is σ = 20983993464. Its totient is φ = 20983993462.

The previous prime is 20983993439. The next prime is 20983993477. The reversal of 20983993463 is 36439938902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20983993463 - 2⁶ = 20983993399 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20983993399 and 20983993408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20983993493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10491996731 + 10491996732.

It is an arithmetic number, because the mean of its divisors is an integer number (10491996732).

Almost surely, 2^20983993463 is an apocalyptic number.

20983993463 is a deficient number, since it is larger than the sum of its proper divisors (1).

20983993463 is an equidigital number, since it uses as much as digits as its factorization.

20983993463 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7558272, while the sum is 56.

The spelling of 20983993463 in words is "twenty billion, nine hundred eighty-three million, nine hundred ninety-three thousand, four hundred sixty-three".