20403785873025 has 45 divisors (see below), whose sum is σ = 37795241122771. Its totient is φ = 10881910722960.

The previous prime is 20403785872963. The next prime is 20403785873071. The reversal of 20403785873025 is 52037858730402.

The square root of 20403785873025 is 4517055.

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

20403785873025 is a `hidden beast` number, since 2 + 0 + 4 + 0 + 3 + 7 + 8 + 587 + 30 + 25 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7345362914289 + 13058422958736 = 2710233^2 + 3613644^2 .

It is a tau number, because it is divible by the number of its divisors (45).

It is not a de Polignac number, because 20403785873025 - 2²³ = 20403777484417 is a prime.

It is a super-2 number, since 2×20403785873025² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 203217286 + ... + 203317664.

Almost surely, 2^{20403785873025} is an apocalyptic number.

20403785873025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20403785873025 is the 4517055-th square number.

20403785873025 is the 2258528-th centered octagonal number.

It is an amenable number.

20403785873025 is a deficient number, since it is larger than the sum of its proper divisors (17391455249746).

20403785873025 is an frugal number, since it uses more digits than its factorization.

20403785873025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200780 (or 100387 counting only the distinct ones).

The product of its (nonzero) digits is 11289600, while the sum is 54.

The spelling of 20403785873025 in words is "twenty trillion, four hundred three billion, seven hundred eighty-five million, eight hundred seventy-three thousand, twenty-five".