20758997 has 12 divisors (see below), whose sum is σ = 24739596. Its totient is φ = 17357760.

The previous prime is 20758979. The next prime is 20759029. The reversal of 20758997 is 79985702.

It can be written as a sum of positive squares in 2 ways, for example, as 7150276 + 13608721 = 2674^2 + 3689^2 .

It is not a de Polignac number, because 20758997 - 2⁸ = 20758741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20758597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3158 + ... + 7175.

It is an arithmetic number, because the mean of its divisors is an integer number (2061633).

Almost surely, 2^20758997 is an apocalyptic number.

It is an amenable number.

20758997 is a deficient number, since it is larger than the sum of its proper divisors (3980599).

20758997 is a wasteful number, since it uses less digits than its factorization.

20758997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10388 (or 10381 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 47.

The square root of 20758997 is about 4556.2042315945. The cubic root of 20758997 is about 274.8329431651.

The spelling of 20758997 in words is "twenty million, seven hundred fifty-eight thousand, nine hundred ninety-seven".