20751475388 has 48 divisors (see below), whose sum is σ = 42050125824. Its totient is φ = 8776978560.

The previous prime is 20751475369. The next prime is 20751475417. The reversal of 20751475388 is 88357415702.

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 15 ways as a sum of consecutive naturals, for example, 663920 + ... + 694472.

It is an arithmetic number, because the mean of its divisors is an integer number (876044288).

Almost surely, 2^20751475388 is an apocalyptic number.

20751475388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20751475388 is an abundant number, since it is smaller than the sum of its proper divisors (21298650436).

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

20751475388 is a wasteful number, since it uses less digits than its factorization.

20751475388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30882 (or 30880 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 50.

The spelling of 20751475388 in words is "twenty billion, seven hundred fifty-one million, four hundred seventy-five thousand, three hundred eighty-eight".