20123797 has 4 divisors (see below), whose sum is σ = 20137996. Its totient is φ = 20109600.

The previous prime is 20123783. The next prime is 20123809. The reversal of 20123797 is 79732102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5424241 + 14699556 = 2329^2 + 3834^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123797 - 2¹⁹ = 19599509 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 (20123707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4704 + ... + 7897.

It is an arithmetic number, because the mean of its divisors is an integer number (5034499).

Almost surely, 2^20123797 is an apocalyptic number.

It is an amenable number.

20123797 is a deficient number, since it is larger than the sum of its proper divisors (14199).

20123797 is a wasteful number, since it uses less digits than its factorization.

20123797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14198.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 20123797 is about 4485.9555280899. The cubic root of 20123797 is about 272.0006713147. Note that the first 3 decimals are identical.

Adding to 20123797 its reverse (79732102), we get a palindrome (99855899).

The spelling of 20123797 in words is "twenty million, one hundred twenty-three thousand, seven hundred ninety-seven".