10399999999920 has 80 divisors (see below), whose sum is σ = 33641739148032. Its totient is φ = 2652753621760.

The previous prime is 10399999999919. The next prime is 10399999999927. The reversal of 10399999999920 is 2999999999301.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (10399999999927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 942023466 + ... + 942034505.

Almost surely, 2^{10399999999920} is an apocalyptic number.

10399999999920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10399999999920 is an abundant number, since it is smaller than the sum of its proper divisors (23241739148112).

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

10399999999920 is a wasteful number, since it uses less digits than its factorization.

10399999999920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1884058010 (or 1884058004 counting only the distinct ones).

The product of its (nonzero) digits is 2324522934, while the sum is 87.

The spelling of 10399999999920 in words is "ten trillion, three hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred twenty".