20129453560 has 64 divisors (see below), whose sum is σ = 45704217600. Its totient is φ = 7978653696.

The previous prime is 20129453557. The next prime is 20129453569. The reversal of 20129453560 is 6535492102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20129453569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2401056 + ... + 2409424.

It is an arithmetic number, because the mean of its divisors is an integer number (714128400).

Almost surely, 2^20129453560 is an apocalyptic number.

20129453560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20129453560 is an abundant number, since it is smaller than the sum of its proper divisors (25574764040).

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

20129453560 is a wasteful number, since it uses less digits than its factorization.

20129453560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8920 (or 8916 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 20129453560 in words is "twenty billion, one hundred twenty-nine million, four hundred fifty-three thousand, five hundred sixty".