20010091000 has 64 divisors (see below), whose sum is σ = 47965750560. Its totient is φ = 7808800000.

The previous prime is 20010090929. The next prime is 20010091001. The reversal of 20010091000 is 19001002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010091001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203026 + ... + 285025.

Almost surely, 2^20010091000 is an apocalyptic number.

20010091000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20010091000 is an abundant number, since it is smaller than the sum of its proper divisors (27955659560).

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

20010091000 is a wasteful number, since it uses less digits than its factorization.

20010091000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488113 (or 488099 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 20010091000 its reverse (19001002), we get a palindrome (20029092002).

The spelling of 20010091000 in words is "twenty billion, ten million, ninety-one thousand".