10020991000 has 64 divisors (see below), whose sum is σ = 23488452000. Its totient is φ = 4001673600.

The previous prime is 10020990983. The next prime is 10020991021. The reversal of 10020991000 is 19902001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 610906 + ... + 627094.

Almost surely, 2^10020991000 is an apocalyptic number.

10020991000 is a gapful number since it is divisible by the number (10) 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 10020991000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11744226000).

10020991000 is an abundant number, since it is smaller than the sum of its proper divisors (13467461000).

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

10020991000 is a wasteful number, since it uses less digits than its factorization.

10020991000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16829 (or 16815 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 22.

The spelling of 10020991000 in words is "ten billion, twenty million, nine hundred ninety-one thousand".