20143897 has 2 divisors, whose sum is σ = 20143898. Its totient is φ = 20143896.

The previous prime is 20143891. The next prime is 20143901. The reversal of 20143897 is 79834102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19175641 + 968256 = 4379^2 + 984^2 .

It is a cyclic number.

It is not a de Polignac number, because 20143897 - 2³ = 20143889 is a prime.

It is not a weakly prime, because it can be changed into another prime (20143891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10071948 + 10071949.

It is an arithmetic number, because the mean of its divisors is an integer number (10071949).

Almost surely, 2^20143897 is an apocalyptic number.

It is an amenable number.

20143897 is a deficient number, since it is larger than the sum of its proper divisors (1).

20143897 is an equidigital number, since it uses as much as digits as its factorization.

20143897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 20143897 is about 4488.1952943249. The cubic root of 20143897 is about 272.0912008546.

Adding to 20143897 its reverse (79834102), we get a palindrome (99977999).

The spelling of 20143897 in words is "twenty million, one hundred forty-three thousand, eight hundred ninety-seven".