20388249600 has 456 divisors, whose sum is σ = 72552932208. Its totient is φ = 5033164800.

The previous prime is 20388249547. The next prime is 20388249631. The reversal of 20388249600 is 694288302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 334233570 + ... + 334233630.

Almost surely, 2^20388249600 is an apocalyptic number.

20388249600 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 20388249600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36276466104).

20388249600 is an abundant number, since it is smaller than the sum of its proper divisors (52164682608).

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

20388249600 is an frugal number, since it uses more digits than its factorization.

20388249600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The spelling of 20388249600 in words is "twenty billion, three hundred eighty-eight million, two hundred forty-nine thousand, six hundred".