20787934100 has 18 divisors (see below), whose sum is σ = 45109817214. Its totient is φ = 8315173600.

The previous prime is 20787934099. The next prime is 20787934117. The reversal of 20787934100 is 143978702.

It can be written as a sum of positive squares in 3 ways, for example, as 4910926084 + 15877008016 = 70078^2 + 126004^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103939571 + ... + 103939770.

Almost surely, 2^20787934100 is an apocalyptic number.

20787934100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20787934100 is an abundant number, since it is smaller than the sum of its proper divisors (24321883114).

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

20787934100 is a wasteful number, since it uses less digits than its factorization.

20787934100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207879355 (or 207879348 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 41.

The spelling of 20787934100 in words is "twenty billion, seven hundred eighty-seven million, nine hundred thirty-four thousand, one hundred".