20534817072 has 640 divisors, whose sum is σ = 73509009408. Its totient is φ = 4817387520.

The previous prime is 20534817019. The next prime is 20534817097. The reversal of 20534817072 is 27071843502.

It is a self number, because there is not a number n which added to its sum of digits gives 20534817072.

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 127 ways as a sum of consecutive naturals, for example, 281298828 + ... + 281298900.

Almost surely, 2^20534817072 is an apocalyptic number.

20534817072 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20534817072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36754504704).

20534817072 is an abundant number, since it is smaller than the sum of its proper divisors (52974192336).

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

20534817072 is a wasteful number, since it uses less digits than its factorization.

20534817072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The spelling of 20534817072 in words is "twenty billion, five hundred thirty-four million, eight hundred seventeen thousand, seventy-two".