20859361512025 has 9 divisors (see below), whose sum is σ = 25865636591613. Its totient is φ = 16687470940800.

The previous prime is 20859361512019. The next prime is 20859361512053. The reversal of 20859361512025 is 52021516395802.

The square root of 20859361512025 is 4567205.

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

It can be written as a sum of positive squares in 4 ways, for example, as 12116435071689 + 8742926440336 = 3480867^2 + 2956844^2 .

It is not a de Polignac number, because 20859361512025 - 2¹³ = 20859361503833 is a prime.

It is a super-2 number, since 2×20859361512025² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20859361512025.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 22379305 + ... + 23292745.

Almost surely, 2^{20859361512025} is an apocalyptic number.

20859361512025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20859361512025 is the 4567205-th square number.

20859361512025 is the 2283603-rd centered octagonal number.

It is an amenable number.

20859361512025 is a deficient number, since it is larger than the sum of its proper divisors (5006275079588).

20859361512025 is an frugal number, since it uses more digits than its factorization.

20859361512025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1826892 (or 913446 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 49.

The spelling of 20859361512025 in words is "twenty trillion, eight hundred fifty-nine billion, three hundred sixty-one million, five hundred twelve thousand, twenty-five".