20029987140 has 24 divisors (see below), whose sum is σ = 56083964160. Its totient is φ = 5341329888.

The previous prime is 20029987123. The next prime is 20029987141. The reversal of 20029987140 is 4178992002.

It is a junction number, because it is equal to n+sod(n) for n = 20029987092 and 20029987101.

It is not an unprimeable number, because it can be changed into a prime (20029987141) 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, 166916500 + ... + 166916619.

It is an arithmetic number, because the mean of its divisors is an integer number (2336831840).

Almost surely, 2^20029987140 is an apocalyptic number.

20029987140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20029987140 is an abundant number, since it is smaller than the sum of its proper divisors (36053977020).

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

20029987140 is a wasteful number, since it uses less digits than its factorization.

20029987140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333833131 (or 333833129 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 20029987140 in words is "twenty billion, twenty-nine million, nine hundred eighty-seven thousand, one hundred forty".