20388379620 has 240 divisors, whose sum is σ = 66959944128. Its totient is φ = 4634945280.

The previous prime is 20388379577. The next prime is 20388379639. The reversal of 20388379620 is 2697388302.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20388379620.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 44226190 + ... + 44226650.

Almost surely, 2^20388379620 is an apocalyptic number.

20388379620 is a gapful number since it is divisible by the number (20) 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 20388379620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33479972064).

20388379620 is an abundant number, since it is smaller than the sum of its proper divisors (46571564508).

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

20388379620 is a wasteful number, since it uses less digits than its factorization.

20388379620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808 (or 785 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 20388379620 in words is "twenty billion, three hundred eighty-eight million, three hundred seventy-nine thousand, six hundred twenty".