20387203781 has 8 divisors (see below), whose sum is σ = 23300706240. Its totient is φ = 17473962528.

The previous prime is 20387203663. The next prime is 20387203787. The reversal of 20387203781 is 18730278302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20387203781 - 2²² = 20383009477 is a prime.

It is a super-2 number, since 2×20387203781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148730 + ... + 250788.

It is an arithmetic number, because the mean of its divisors is an integer number (2912588280).

Almost surely, 2^20387203781 is an apocalyptic number.

It is an amenable number.

20387203781 is a deficient number, since it is larger than the sum of its proper divisors (2913502459).

20387203781 is a wasteful number, since it uses less digits than its factorization.

20387203781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130603.

The product of its (nonzero) digits is 112896, while the sum is 41.

The spelling of 20387203781 in words is "twenty billion, three hundred eighty-seven million, two hundred three thousand, seven hundred eighty-one".