20136455880 has 64 divisors (see below), whose sum is σ = 60547132800. Its totient is φ = 5357475840.

The previous prime is 20136455879. The next prime is 20136455887. The reversal of 20136455880 is 8855463102.

It is not an unprimeable number, because it can be changed into a prime (20136455887) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 138441 + ... + 243800.

It is an arithmetic number, because the mean of its divisors is an integer number (946048950).

Almost surely, 2^20136455880 is an apocalyptic number.

20136455880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20136455880 is an abundant number, since it is smaller than the sum of its proper divisors (40410676920).

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

20136455880 is a wasteful number, since it uses less digits than its factorization.

20136455880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382694 (or 382690 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 42.

The spelling of 20136455880 in words is "twenty billion, one hundred thirty-six million, four hundred fifty-five thousand, eight hundred eighty".