20387490788 has 48 divisors (see below), whose sum is σ = 43327436544. Its totient is φ = 8194206720.

The previous prime is 20387490707. The next prime is 20387490803. The reversal of 20387490788 is 88709478302.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57545 + ... + 209967.

It is an arithmetic number, because the mean of its divisors is an integer number (902654928).

Almost surely, 2^20387490788 is an apocalyptic number.

20387490788 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20387490788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21663718272).

20387490788 is an abundant number, since it is smaller than the sum of its proper divisors (22939945756).

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

20387490788 is a wasteful number, since it uses less digits than its factorization.

20387490788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152732 (or 152730 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 56.

The spelling of 20387490788 in words is "twenty billion, three hundred eighty-seven million, four hundred ninety thousand, seven hundred eighty-eight".