20587088440 has 32 divisors (see below), whose sum is σ = 46471859280. Its totient is φ = 8208006912.

The previous prime is 20587088413. The next prime is 20587088447. The reversal of 20587088440 is 4488078502.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20587088447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 825957 + ... + 850516.

Almost surely, 2^20587088440 is an apocalyptic number.

20587088440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20587088440 is an abundant number, since it is smaller than the sum of its proper divisors (25884770840).

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

20587088440 is a wasteful number, since it uses less digits than its factorization.

20587088440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676791 (or 1676787 counting only the distinct ones).

The product of its (nonzero) digits is 573440, while the sum is 46.

The spelling of 20587088440 in words is "twenty billion, five hundred eighty-seven million, eighty-eight thousand, four hundred forty".