20626660553640 has 64 divisors (see below), whose sum is σ = 61880291789760. Its totient is φ = 5500415247360.

The previous prime is 20626660553599. The next prime is 20626660553663. The reversal of 20626660553640 is 4635506662602.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37397952 + ... + 37945488.

It is an arithmetic number, because the mean of its divisors is an integer number (966879559215).

Almost surely, 2^{20626660553640} is an apocalyptic number.

20626660553640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20626660553640 is an abundant number, since it is smaller than the sum of its proper divisors (41253631236120).

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

20626660553640 is a wasteful number, since it uses less digits than its factorization.

20626660553640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861482 (or 861478 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 51.

The spelling of 20626660553640 in words is "twenty trillion, six hundred twenty-six billion, six hundred sixty million, five hundred fifty-three thousand, six hundred forty".