20087000640 has 504 divisors, whose sum is σ = 83481428160. Its totient is φ = 4330672128.

The previous prime is 20087000629. The next prime is 20087000651. The reversal of 20087000640 is 4600078002.

It is an interprime number because it is at equal distance from previous prime (20087000629) and next prime (20087000651).

It is a tau number, because it is divible by the number of its divisors (504).

It is a super-2 number, since 2×20087000640² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 87716046 + ... + 87716274.

Almost surely, 2^20087000640 is an apocalyptic number.

20087000640 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 20087000640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41740714080).

20087000640 is an abundant number, since it is smaller than the sum of its proper divisors (63394427520).

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

20087000640 is a wasteful number, since it uses less digits than its factorization.

20087000640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

Adding to 20087000640 its reverse (4600078002), we get a palindrome (24687078642).

The spelling of 20087000640 in words is "twenty billion, eighty-seven million, six hundred forty", and thus it is an aban number.