20381033988 has 108 divisors (see below), whose sum is σ = 59637876480. Its totient is φ = 5748998112.

The previous prime is 20381033963. The next prime is 20381033989. The reversal of 20381033988 is 88933018302.

It is a super-2 number, since 2×20381033988² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20381033989) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1566253 + ... + 1579211.

It is an arithmetic number, because the mean of its divisors is an integer number (552202560).

Almost surely, 2^20381033988 is an apocalyptic number.

20381033988 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 20381033988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29818938240).

20381033988 is an abundant number, since it is smaller than the sum of its proper divisors (39256842492).

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

20381033988 is a wasteful number, since it uses less digits than its factorization.

20381033988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13134 (or 13050 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 20381033988 in words is "twenty billion, three hundred eighty-one million, thirty-three thousand, nine hundred eighty-eight".