20195555040 has 144 divisors (see below), whose sum is σ = 71469962928. Its totient is φ = 5385470976.

The previous prime is 20195554997. The next prime is 20195555063. The reversal of 20195555040 is 4055559102.

20195555040 is a `hidden beast` number, since 2 + 0 + 19 + 55 + 550 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20195554986 and 20195555004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 220837 + ... + 298596.

It is an arithmetic number, because the mean of its divisors is an integer number (496319187).

Almost surely, 2^20195555040 is an apocalyptic number.

20195555040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20195555040 is an abundant number, since it is smaller than the sum of its proper divisors (51274407888).

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

20195555040 is an equidigital number, since it uses as much as digits as its factorization.

20195555040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519463 (or 519443 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The spelling of 20195555040 in words is "twenty billion, one hundred ninety-five million, five hundred fifty-five thousand, forty".