20712513645220 has 24 divisors (see below), whose sum is σ = 44209332406008. Its totient is φ = 8149185696000.

The previous prime is 20712513645191. The next prime is 20712513645277. The reversal of 20712513645220 is 2254631521702.

It can be written as a sum of positive squares in 4 ways, for example, as 212699905636 + 20499813739584 = 461194^2 + 4527672^2 .

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, 8488733881 + ... + 8488736320.

It is an arithmetic number, because the mean of its divisors is an integer number (1842055516917).

Almost surely, 2^{20712513645220} is an apocalyptic number.

20712513645220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20712513645220 is an abundant number, since it is smaller than the sum of its proper divisors (23496818760788).

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

20712513645220 is a wasteful number, since it uses less digits than its factorization.

20712513645220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16977470271 (or 16977470269 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 40.

The spelling of 20712513645220 in words is "twenty trillion, seven hundred twelve billion, five hundred thirteen million, six hundred forty-five thousand, two hundred twenty".