20836445680 has 40 divisors (see below), whose sum is σ = 48465728352. Its totient is φ = 8330966784.

The previous prime is 20836445653. The next prime is 20836445681. The reversal of 20836445680 is 8654463802.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20836445680.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20836445681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133309 + ... + 243811.

Almost surely, 2^20836445680 is an apocalyptic number.

20836445680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20836445680 is an abundant number, since it is smaller than the sum of its proper divisors (27629282672).

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

20836445680 is a wasteful number, since it uses less digits than its factorization.

20836445680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112873 (or 112867 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 46.

The spelling of 20836445680 in words is "twenty billion, eight hundred thirty-six million, four hundred forty-five thousand, six hundred eighty".