20787819520 has 352 divisors, whose sum is σ = 57708499968. Its totient is φ = 7123894272.

The previous prime is 20787819463. The next prime is 20787819539. The reversal of 20787819520 is 2591878702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56642377 + ... + 56642743.

Almost surely, 2^20787819520 is an apocalyptic number.

20787819520 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 20787819520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28854249984).

20787819520 is an abundant number, since it is smaller than the sum of its proper divisors (36920680448).

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

20787819520 is a wasteful number, since it uses less digits than its factorization.

20787819520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465 (or 447 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 49.

The spelling of 20787819520 in words is "twenty billion, seven hundred eighty-seven million, eight hundred nineteen thousand, five hundred twenty".