20199427 has 2 divisors, whose sum is σ = 20199428. Its totient is φ = 20199426.

The previous prime is 20199409. The next prime is 20199437. The reversal of 20199427 is 72499102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20199427 is a prime.

It is a super-2 number, since 2×20199427² = 816033702256658, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20199392 and 20199401.

It is not a weakly prime, because it can be changed into another prime (20199437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10099713 + 10099714.

It is an arithmetic number, because the mean of its divisors is an integer number (10099714).

Almost surely, 2^20199427 is an apocalyptic number.

20199427 is a deficient number, since it is larger than the sum of its proper divisors (1).

20199427 is an equidigital number, since it uses as much as digits as its factorization.

20199427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 20199427 is about 4494.3772649834. The cubic root of 20199427 is about 272.3409930028.

The spelling of 20199427 in words is "twenty million, one hundred ninety-nine thousand, four hundred twenty-seven".