20802817502 has 4 divisors (see below), whose sum is σ = 31204226256. Its totient is φ = 10401408750.

The previous prime is 20802817481. The next prime is 20802817517. The reversal of 20802817502 is 20571820802.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5200704374 + ... + 5200704377.

It is an arithmetic number, because the mean of its divisors is an integer number (7801056564).

Almost surely, 2^20802817502 is an apocalyptic number.

20802817502 is a deficient number, since it is larger than the sum of its proper divisors (10401408754).

20802817502 is a wasteful number, since it uses less digits than its factorization.

20802817502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10401408753.

The product of its (nonzero) digits is 17920, while the sum is 35.

The spelling of 20802817502 in words is "twenty billion, eight hundred two million, eight hundred seventeen thousand, five hundred two".