10191011920 has 40 divisors (see below), whose sum is σ = 24458434560. Its totient is φ = 3944906880.

The previous prime is 10191011903. The next prime is 10191011923. The reversal of 10191011920 is 2911019101.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10191011923) 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, 2052160 + ... + 2057119.

It is an arithmetic number, because the mean of its divisors is an integer number (611460864).

Almost surely, 2^10191011920 is an apocalyptic number.

10191011920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10191011920 is an abundant number, since it is smaller than the sum of its proper divisors (14267422640).

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

10191011920 is a wasteful number, since it uses less digits than its factorization.

10191011920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4109323 (or 4109317 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 25.

The spelling of 10191011920 in words is "ten billion, one hundred ninety-one million, eleven thousand, nine hundred twenty".