20520129432 has 32 divisors (see below), whose sum is σ = 55963990080. Its totient is φ = 6218220960.

The previous prime is 20520129403. The next prime is 20520129457. The reversal of 20520129432 is 23492102502.

It is a self number, because there is not a number n which added to its sum of digits gives 20520129432.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38863618 + ... + 38864145.

It is an arithmetic number, because the mean of its divisors is an integer number (1748874690).

Almost surely, 2^20520129432 is an apocalyptic number.

20520129432 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20520129432 is an abundant number, since it is smaller than the sum of its proper divisors (35443860648).

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

20520129432 is a wasteful number, since it uses less digits than its factorization.

20520129432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77727783 (or 77727779 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The spelling of 20520129432 in words is "twenty billion, five hundred twenty million, one hundred twenty-nine thousand, four hundred thirty-two".