20121550672758 has 16 divisors (see below), whose sum is σ = 41002405145136. Its totient is φ = 6580632924320.

The previous prime is 20121550672739. The next prime is 20121550672813. The reversal of 20121550672758 is 85727605512102.

It is a self number, because there is not a number n which added to its sum of digits gives 20121550672758.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 31637657973 + ... + 31637658608.

It is an arithmetic number, because the mean of its divisors is an integer number (2562650321571).

Almost surely, 2^{20121550672758} is an apocalyptic number.

20121550672758 is an abundant number, since it is smaller than the sum of its proper divisors (20880854472378).

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

20121550672758 is a wasteful number, since it uses less digits than its factorization.

20121550672758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63275316639.

The product of its (nonzero) digits is 2352000, while the sum is 51.

The spelling of 20121550672758 in words is "twenty trillion, one hundred twenty-one billion, five hundred fifty million, six hundred seventy-two thousand, seven hundred fifty-eight".