20380721700 has 36 divisors (see below), whose sum is σ = 58968222320. Its totient is φ = 5434859040.

The previous prime is 20380721687. The next prime is 20380721741. The reversal of 20380721700 is 712708302.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33967570 + ... + 33968169.

Almost surely, 2^20380721700 is an apocalyptic number.

20380721700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20380721700 is an abundant number, since it is smaller than the sum of its proper divisors (38587500620).

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

20380721700 is a wasteful number, since it uses less digits than its factorization.

20380721700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67935756 (or 67935749 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The spelling of 20380721700 in words is "twenty billion, three hundred eighty million, seven hundred twenty-one thousand, seven hundred".