20856725746 has 8 divisors (see below), whose sum is σ = 31296602880. Its totient is φ = 10424524788.

The previous prime is 20856725741. The next prime is 20856725753. The reversal of 20856725746 is 64752765802.

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

It is a junction number, because it is equal to n+sod(n) for n = 20856725693 and 20856725702.

It is not an unprimeable number, because it can be changed into a prime (20856725741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1912246 + ... + 1923121.

It is an arithmetic number, because the mean of its divisors is an integer number (3912075360).

Almost surely, 2^20856725746 is an apocalyptic number.

20856725746 is a deficient number, since it is larger than the sum of its proper divisors (10439877134).

20856725746 is a wasteful number, since it uses less digits than its factorization.

20856725746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3838088.

The product of its (nonzero) digits is 5644800, while the sum is 52.

The spelling of 20856725746 in words is "twenty billion, eight hundred fifty-six million, seven hundred twenty-five thousand, seven hundred forty-six".