1020191010920 has 32 divisors (see below), whose sum is σ = 2295793372320. Its totient is φ = 408011764800.

The previous prime is 1020191010877. The next prime is 1020191010961. The reversal of 1020191010920 is 290101910201.

It is a self number, because there is not a number n which added to its sum of digits gives 1020191010920.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1763906 + ... + 2269745.

It is an arithmetic number, because the mean of its divisors is an integer number (71743542885).

Almost surely, 2^{1020191010920} is an apocalyptic number.

1020191010920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020191010920 is an abundant number, since it is smaller than the sum of its proper divisors (1275602361400).

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

1020191010920 is a wasteful number, since it uses less digits than its factorization.

1020191010920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4039985 (or 4039981 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 26.

The spelling of 1020191010920 in words is "one trillion, twenty billion, one hundred ninety-one million, ten thousand, nine hundred twenty".