20699556599960 has 128 divisors (see below), whose sum is σ = 54122882486400. Its totient is φ = 6978478510080.

The previous prime is 20699556599957. The next prime is 20699556600059. The reversal of 20699556599960 is 6999565599602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2215934 + ... + 6805106.

It is an arithmetic number, because the mean of its divisors is an integer number (422835019425).

Almost surely, 2^{20699556599960} is an apocalyptic number.

20699556599960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20699556599960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27061441243200).

20699556599960 is an abundant number, since it is smaller than the sum of its proper divisors (33423325886440).

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

20699556599960 is a wasteful number, since it uses less digits than its factorization.

20699556599960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4589461 (or 4589457 counting only the distinct ones).

The product of its (nonzero) digits is 3188646000, while the sum is 80.

The spelling of 20699556599960 in words is "twenty trillion, six hundred ninety-nine billion, five hundred fifty-six million, five hundred ninety-nine thousand, nine hundred sixty".