20956467860156 has 24 divisors (see below), whose sum is σ = 37939605182640. Its totient is φ = 10116602988800.

The previous prime is 20956467860143. The next prime is 20956467860221. The reversal of 20956467860156 is 65106876465902.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20956467860092 and 20956467860101.

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 in 7 ways as a sum of consecutive naturals, for example, 1002911 + ... + 6551241.

It is an arithmetic number, because the mean of its divisors is an integer number (1580816882610).

Almost surely, 2^{20956467860156} is an apocalyptic number.

It is an amenable number.

20956467860156 is a deficient number, since it is larger than the sum of its proper divisors (16983137322484).

20956467860156 is a wasteful number, since it uses less digits than its factorization.

20956467860156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5580925 (or 5580923 counting only the distinct ones).

The product of its (nonzero) digits is 130636800, while the sum is 65.

The spelling of 20956467860156 in words is "twenty trillion, nine hundred fifty-six billion, four hundred sixty-seven million, eight hundred sixty thousand, one hundred fifty-six".