20425637 has 2 divisors, whose sum is σ = 20425638. Its totient is φ = 20425636.

The previous prime is 20425607. The next prime is 20425673. The reversal of 20425637 is 73652402.

Together with next prime (20425673) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16924996 + 3500641 = 4114^2 + 1871^2 .

It is a cyclic number.

It is not a de Polignac number, because 20425637 - 2²² = 16231333 is a prime.

It is a pancake number, because a pancake can be divided into 20425637 parts by 6391 straight cuts.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20425607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212818 + 10212819.

It is an arithmetic number, because the mean of its divisors is an integer number (10212819).

Almost surely, 2^20425637 is an apocalyptic number.

It is an amenable number.

20425637 is a deficient number, since it is larger than the sum of its proper divisors (1).

20425637 is an equidigital number, since it uses as much as digits as its factorization.

20425637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 20425637 is about 4519.4730887571. The cubic root of 20425637 is about 273.3538551252.

The spelling of 20425637 in words is "twenty million, four hundred twenty-five thousand, six hundred thirty-seven".