20145519100 has 36 divisors (see below), whose sum is σ = 49960889104. Its totient is φ = 6907034880.

The previous prime is 20145519091. The next prime is 20145519131. The reversal of 20145519100 is 191554102.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14388957 + ... + 14390356.

Almost surely, 2^20145519100 is an apocalyptic number.

20145519100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20145519100 is an abundant number, since it is smaller than the sum of its proper divisors (29815370004).

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

20145519100 is a wasteful number, since it uses less digits than its factorization.

20145519100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28779334 (or 28779327 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 28.

The spelling of 20145519100 in words is "twenty billion, one hundred forty-five million, five hundred nineteen thousand, one hundred".