20383897 has 4 divisors (see below), whose sum is σ = 21086820. Its totient is φ = 19680976.

The previous prime is 20383877. The next prime is 20383907. The reversal of 20383897 is 79838302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79838302 = 2 ⋅39919151.

It can be written as a sum of positive squares in 2 ways, for example, as 4575321 + 15808576 = 2139^2 + 3976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20383897 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20383877) 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, 351418 + ... + 351475.

It is an arithmetic number, because the mean of its divisors is an integer number (5271705).

Almost surely, 2^20383897 is an apocalyptic number.

It is an amenable number.

20383897 is a deficient number, since it is larger than the sum of its proper divisors (702923).

20383897 is an equidigital number, since it uses as much as digits as its factorization.

20383897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702922.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 20383897 is about 4514.8529322670. The cubic root of 20383897 is about 273.1675276722.

It can be divided in two parts, 203 and 83897, that added together give a square (84100 = 290²).

The spelling of 20383897 in words is "twenty million, three hundred eighty-three thousand, eight hundred ninety-seven".