20256661662860 has 96 divisors (see below), whose sum is σ = 49444930579968. Its totient is φ = 6827711754240.

The previous prime is 20256661662773. The next prime is 20256661662869. The reversal of 20256661662860 is 6826616665202.

It is a junction number, because it is equal to n+sod(n) for n = 20256661662796 and 20256661662805.

It is not an unprimeable number, because it can be changed into a prime (20256661662869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3198869 + ... + 7123628.

It is an arithmetic number, because the mean of its divisors is an integer number (515051360208).

Almost surely, 2^{20256661662860} is an apocalyptic number.

20256661662860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20256661662860 is an abundant number, since it is smaller than the sum of its proper divisors (29188268917108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20256661662860 is a wasteful number, since it uses less digits than its factorization.

20256661662860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10322751 (or 10322749 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 56.

The spelling of 20256661662860 in words is "twenty trillion, two hundred fifty-six billion, six hundred sixty-one million, six hundred sixty-two thousand, eight hundred sixty".