20514997 has 4 divisors (see below), whose sum is σ = 20534796. Its totient is φ = 20495200.

The previous prime is 20514979. The next prime is 20515007. The reversal of 20514997 is 79941502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79941502 = 2 ⋅39970751.

It can be written as a sum of positive squares in 2 ways, for example, as 4626801 + 15888196 = 2151^2 + 3986^2 .

It is a cyclic number.

It is not a de Polignac number, because 20514997 - 2¹¹ = 20512949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20514917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8254 + ... + 10447.

It is an arithmetic number, because the mean of its divisors is an integer number (5133699).

Almost surely, 2^20514997 is an apocalyptic number.

It is an amenable number.

20514997 is a deficient number, since it is larger than the sum of its proper divisors (19799).

20514997 is a wasteful number, since it uses less digits than its factorization.

20514997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19798.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 20514997 is about 4529.3484078839. The cubic root of 20514997 is about 273.7519066053.

The spelling of 20514997 in words is "twenty million, five hundred fourteen thousand, nine hundred ninety-seven".