20501095499 has 4 divisors (see below), whose sum is σ = 20516160120. Its totient is φ = 20486030880.

The previous prime is 20501095493. The next prime is 20501095507. The reversal of 20501095499 is 99459010502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20501095499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20501095493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7530269 + ... + 7532990.

It is an arithmetic number, because the mean of its divisors is an integer number (5129040030).

Almost surely, 2^20501095499 is an apocalyptic number.

20501095499 is a deficient number, since it is larger than the sum of its proper divisors (15064621).

20501095499 is a wasteful number, since it uses less digits than its factorization.

20501095499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15064620.

The product of its (nonzero) digits is 145800, while the sum is 44.

The spelling of 20501095499 in words is "twenty billion, five hundred one million, ninety-five thousand, four hundred ninety-nine".