20520610081024 has 81 divisors (see below), whose sum is σ = 42329644269129. Its totient is φ = 9928240266240.

The previous prime is 20520610080983. The next prime is 20520610081031. The reversal of 20520610081024 is 42018001602502.

The square root of 20520610081024 is 4529968.

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., 16401204025600 + 4119406055424 = 4049840^2 + 2029632^2 .

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2246859562 + ... + 2246868694.

Almost surely, 2^{20520610081024} is an apocalyptic number.

20520610081024 is the 4529968-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20520610081024

20520610081024 is an abundant number, since it is smaller than the sum of its proper divisors (21809034188105).

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

20520610081024 is an frugal number, since it uses more digits than its factorization.

20520610081024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18344 (or 9166 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

Adding to 20520610081024 its reverse (42018001602502), we get a palindrome (62538611683526).

The spelling of 20520610081024 in words is "twenty trillion, five hundred twenty billion, six hundred ten million, eighty-one thousand, twenty-four".