20675997 has 6 divisors (see below), whose sum is σ = 29865342. Its totient is φ = 13783992.

The previous prime is 20675983. The next prime is 20676017. The reversal of 20675997 is 79957602.

It can be written as a sum of positive squares in only one way, i.e., 18071001 + 2604996 = 4251^2 + 1614^2 .

It is not a de Polignac number, because 20675997 - 2¹² = 20671901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20675917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1148658 + ... + 1148675.

It is an arithmetic number, because the mean of its divisors is an integer number (4977557).

Almost surely, 2^20675997 is an apocalyptic number.

It is an amenable number.

20675997 is a deficient number, since it is larger than the sum of its proper divisors (9189345).

20675997 is a wasteful number, since it uses less digits than its factorization.

20675997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2297339 (or 2297336 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 45.

The square root of 20675997 is about 4547.0866497132. The cubic root of 20675997 is about 274.4661688028.

The spelling of 20675997 in words is "twenty million, six hundred seventy-five thousand, nine hundred ninety-seven".