20387798631225 has 81 divisors (see below), whose sum is σ = 38793407067597. Its totient is φ = 10233297434880.

The previous prime is 20387798631223. The next prime is 20387798631241. The reversal of 20387798631225 is 52213689778302.

The square root of 20387798631225 is 4515285.

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

20387798631225 is a `hidden beast` number, since 2 + 0 + 387 + 79 + 8 + 63 + 122 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 476891068329 + 19910907562896 = 690573^2 + 4462164^2 .

It is not a de Polignac number, because 20387798631225 - 2¹ = 20387798631223 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20387798631223) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1151388822 + ... + 1151406528.

Almost surely, 2^{20387798631225} is an apocalyptic number.

20387798631225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20387798631225 is the 4515285-th square number.

20387798631225 is the 2257643-rd centered octagonal number.

It is an amenable number.

20387798631225 is a deficient number, since it is larger than the sum of its proper divisors (18405608436372).

20387798631225 is an frugal number, since it uses more digits than its factorization.

20387798631225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35464 (or 17732 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 63.

The spelling of 20387798631225 in words is "twenty trillion, three hundred eighty-seven billion, seven hundred ninety-eight million, six hundred thirty-one thousand, two hundred twenty-five".