20688207408820 has 24 divisors (see below), whose sum is σ = 49651697781504. Its totient is φ = 7093099682976.

The previous prime is 20688207408773. The next prime is 20688207408863. The reversal of 20688207408820 is 2880470288602.

It is a super-2 number, since 2×20688207408820² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 73886454892 + ... + 73886455171.

It is an arithmetic number, because the mean of its divisors is an integer number (2068820740896).

Almost surely, 2^{20688207408820} is an apocalyptic number.

20688207408820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20688207408820 is an abundant number, since it is smaller than the sum of its proper divisors (28963490372684).

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

20688207408820 is a wasteful number, since it uses less digits than its factorization.

20688207408820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147772910079 (or 147772910077 counting only the distinct ones).

The product of its (nonzero) digits is 5505024, while the sum is 55.

The spelling of 20688207408820 in words is "twenty trillion, six hundred eighty-eight billion, two hundred seven million, four hundred eight thousand, eight hundred twenty".