20854146089956 has 9 divisors (see below), whose sum is σ = 36494771640649. Its totient is φ = 10427068478344.

The previous prime is 20854146089941. The next prime is 20854146089981. The reversal of 20854146089956 is 65998064145802.

The square root of 20854146089956 is 4566634.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 20846986222500 + 7159867456 = 4565850^2 + 84616^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20854146089891 and 20854146089900.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7991610 + ... + 10274926.

Almost surely, 2^{20854146089956} is an apocalyptic number.

20854146089956 is the 4566634-th square number.

It is an amenable number.

20854146089956 is a deficient number, since it is larger than the sum of its proper divisors (15640625550693).

20854146089956 is an frugal number, since it uses more digits than its factorization.

20854146089956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4566638 (or 2283319 counting only the distinct ones).

The product of its (nonzero) digits is 149299200, while the sum is 67.

The spelling of 20854146089956 in words is "twenty trillion, eight hundred fifty-four billion, one hundred forty-six million, eighty-nine thousand, nine hundred fifty-six".