20387203780 has 12 divisors (see below), whose sum is σ = 42813127980. Its totient is φ = 8154881504.

The previous prime is 20387203663. The next prime is 20387203787. The reversal of 20387203780 is 8730278302.

It can be written as a sum of positive squares in 2 ways, for example, as 3380957316 + 17006246464 = 58146^2 + 130408^2 .

It is not an unprimeable number, because it can be changed into a prime (20387203787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 509680075 + ... + 509680114.

It is an arithmetic number, because the mean of its divisors is an integer number (3567760665).

Almost surely, 2^20387203780 is an apocalyptic number.

20387203780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20387203780 is an abundant number, since it is smaller than the sum of its proper divisors (22425924200).

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

20387203780 is a wasteful number, since it uses less digits than its factorization.

20387203780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019360198 (or 1019360196 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 40.

The spelling of 20387203780 in words is "twenty billion, three hundred eighty-seven million, two hundred three thousand, seven hundred eighty".