20856481502 has 4 divisors (see below), whose sum is σ = 31284722256. Its totient is φ = 10428240750.

The previous prime is 20856481463. The next prime is 20856481543. The reversal of 20856481502 is 20518465802.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20856481502.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5214120374 + ... + 5214120377.

It is an arithmetic number, because the mean of its divisors is an integer number (7821180564).

Almost surely, 2^20856481502 is an apocalyptic number.

20856481502 is a deficient number, since it is larger than the sum of its proper divisors (10428240754).

20856481502 is a wasteful number, since it uses less digits than its factorization.

20856481502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10428240753.

The product of its (nonzero) digits is 153600, while the sum is 41.

The spelling of 20856481502 in words is "twenty billion, eight hundred fifty-six million, four hundred eighty-one thousand, five hundred two".