20856444703 has 8 divisors (see below), whose sum is σ = 20898507056. Its totient is φ = 20814408000.

The previous prime is 20856444649. The next prime is 20856444731. The reversal of 20856444703 is 30744465802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20856444703 - 2²¹ = 20854347551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20856444703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20856444793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2690413 + ... + 2698153.

It is an arithmetic number, because the mean of its divisors is an integer number (2612313382).

Almost surely, 2^20856444703 is an apocalyptic number.

20856444703 is a deficient number, since it is larger than the sum of its proper divisors (42062353).

20856444703 is an equidigital number, since it uses as much as digits as its factorization.

20856444703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12825.

The product of its (nonzero) digits is 645120, while the sum is 43.

The spelling of 20856444703 in words is "twenty billion, eight hundred fifty-six million, four hundred forty-four thousand, seven hundred three".