20988887040 has 408 divisors, whose sum is σ = 79498231488. Its totient is φ = 5080350720.

The previous prime is 20988887027. The next prime is 20988887041. The reversal of 20988887040 is 4078888902.

It is not an unprimeable number, because it can be changed into a prime (20988887041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32439997 + ... + 32440643.

Almost surely, 2^20988887040 is an apocalyptic number.

20988887040 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 20988887040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39749115744).

20988887040 is an abundant number, since it is smaller than the sum of its proper divisors (58509344448).

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

20988887040 is an equidigital number, since it uses as much as digits as its factorization.

20988887040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701 (or 668 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 54.

The spelling of 20988887040 in words is "twenty billion, nine hundred eighty-eight million, eight hundred eighty-seven thousand, forty".