20990641911456 has 96 divisors (see below), whose sum is σ = 63143512104960. Its totient is φ = 5980984701696.

The previous prime is 20990641911439. The next prime is 20990641911457. The reversal of 20990641911456 is 65411914609902.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 20990641911396 and 20990641911405.

It is not an unprimeable number, because it can be changed into a prime (20990641911457) by changing a digit.

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, 42309336 + ... + 42802583.

It is an arithmetic number, because the mean of its divisors is an integer number (657744917760).

Almost surely, 2^{20990641911456} is an apocalyptic number.

It is an amenable number.

20990641911456 is an abundant number, since it is smaller than the sum of its proper divisors (42152870193504).

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

20990641911456 is a wasteful number, since it uses less digits than its factorization.

20990641911456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85112306 (or 85112298 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 57.

The spelling of 20990641911456 in words is "twenty trillion, nine hundred ninety billion, six hundred forty-one million, nine hundred eleven thousand, four hundred fifty-six".