20520238625329 has 9 divisors (see below), whose sum is σ = 20557592228523. Its totient is φ = 20482952796192.

The previous prime is 20520238625273. The next prime is 20520238625347. The reversal of 20520238625329 is 92352683202502.

The square root of 20520238625329 is 4529927.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 12617663058225 + 7902575567104 = 3552135^2 + 2811152^2 .

It is not a de Polignac number, because 20520238625329 - 2⁹ = 20520238624817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20520238125329) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2686242892 + ... + 2686250530.

Almost surely, 2^{20520238625329} is an apocalyptic number.

20520238625329 is the 4529927-th square number.

20520238625329 is the 2264964-th centered octagonal number.

It is an amenable number.

20520238625329 is a deficient number, since it is larger than the sum of its proper divisors (37353603194).

20520238625329 is an frugal number, since it uses more digits than its factorization.

20520238625329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16464 (or 8232 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 49.

The spelling of 20520238625329 in words is "twenty trillion, five hundred twenty billion, two hundred thirty-eight million, six hundred twenty-five thousand, three hundred twenty-nine".