20415506636256 has 24 divisors (see below), whose sum is σ = 53590704920424. Its totient is φ = 6805168878720.

The previous prime is 20415506636251. The next prime is 20415506636267. The reversal of 20415506636256 is 65263660551402.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×20415506636256² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20415506636199 and 20415506636208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20415506636251) 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, 106330763635 + ... + 106330763826.

It is an arithmetic number, because the mean of its divisors is an integer number (2232946038351).

Almost surely, 2^{20415506636256} is an apocalyptic number.

It is an amenable number.

20415506636256 is an abundant number, since it is smaller than the sum of its proper divisors (33175198284168).

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

20415506636256 is a wasteful number, since it uses less digits than its factorization.

20415506636256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212661527474 (or 212661527466 counting only the distinct ones).

The product of its (nonzero) digits is 7776000, while the sum is 51.

The spelling of 20415506636256 in words is "twenty trillion, four hundred fifteen billion, five hundred six million, six hundred thirty-six thousand, two hundred fifty-six".