20499469637893 has 2 divisors, whose sum is σ = 20499469637894. Its totient is φ = 20499469637892.

The previous prime is 20499469637879. The next prime is 20499469637963. The reversal of 20499469637893 is 39873696499402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15587825252164 + 4911644385729 = 3948142^2 + 2216223^2 .

It is a cyclic number.

It is not a de Polignac number, because 20499469637893 - 2²⁹ = 20498932766981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20499469667893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10249734818946 + 10249734818947.

It is an arithmetic number, because the mean of its divisors is an integer number (10249734818947).

Almost surely, 2^{20499469637893} is an apocalyptic number.

It is an amenable number.

20499469637893 is a deficient number, since it is larger than the sum of its proper divisors (1).

20499469637893 is an equidigital number, since it uses as much as digits as its factorization.

20499469637893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3809369088, while the sum is 79.

The spelling of 20499469637893 in words is "twenty trillion, four hundred ninety-nine billion, four hundred sixty-nine million, six hundred thirty-seven thousand, eight hundred ninety-three".