20121750928 has 40 divisors (see below), whose sum is σ = 41627032128. Its totient is φ = 9399637632.

The previous prime is 20121750911. The next prime is 20121750977. The reversal of 20121750928 is 82905712102.

It is a super-2 number, since 2×20121750928² (a number of 21 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 619975 + ... + 651622.

Almost surely, 2^20121750928 is an apocalyptic number.

It is an amenable number.

20121750928 is an abundant number, since it is smaller than the sum of its proper divisors (21505281200).

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

20121750928 is a wasteful number, since it uses less digits than its factorization.

20121750928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271671 (or 1271665 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 37.

The spelling of 20121750928 in words is "twenty billion, one hundred twenty-one million, seven hundred fifty thousand, nine hundred twenty-eight".