20426600206640 has 40 divisors (see below), whose sum is σ = 47509787735520. Its totient is φ = 8167553243136.

The previous prime is 20426600206637. The next prime is 20426600206667. The reversal of 20426600206640 is 4660200662402.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 20426600206594 and 20426600206603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48018785 + ... + 48442304.

It is an arithmetic number, because the mean of its divisors is an integer number (1187744693388).

Almost surely, 2^{20426600206640} is an apocalyptic number.

20426600206640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20426600206640 is an abundant number, since it is smaller than the sum of its proper divisors (27083187528880).

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

20426600206640 is a wasteful number, since it uses less digits than its factorization.

20426600206640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96463749 (or 96463743 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 38.

The spelling of 20426600206640 in words is "twenty trillion, four hundred twenty-six billion, six hundred million, two hundred six thousand, six hundred forty".