20427555625 has 15 divisors (see below), whose sum is σ = 25530739267. Its totient is φ = 16339186000.

The previous prime is 20427555611. The next prime is 20427555647. The reversal of 20427555625 is 52655572402.

The square root of 20427555625 is 142925.

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

It can be written as a sum of positive squares in 7 ways, for example, as 14199820569 + 6227735056 = 119163^2 + 78916^2 .

It is not a de Polignac number, because 20427555625 - 2⁷ = 20427555497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 3570267 + ... + 3575983.

Almost surely, 2^20427555625 is an apocalyptic number.

20427555625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20427555625 is the 142925-th square number.

20427555625 is the 71463-rd centered octagonal number.

It is an amenable number.

20427555625 is a deficient number, since it is larger than the sum of its proper divisors (5103183642).

20427555625 is an frugal number, since it uses more digits than its factorization.

20427555625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11454 (or 5722 counting only the distinct ones).

The product of its (nonzero) digits is 840000, while the sum is 43.

The spelling of 20427555625 in words is "twenty billion, four hundred twenty-seven million, five hundred fifty-five thousand, six hundred twenty-five".