20150197 has 2 divisors, whose sum is σ = 20150198. Its totient is φ = 20150196.

The previous prime is 20150189. The next prime is 20150227. The reversal of 20150197 is 79105102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19722481 + 427716 = 4441^2 + 654^2 .

It is a cyclic number.

It is not a de Polignac number, because 20150197 - 2³ = 20150189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20150177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10075098 + 10075099.

It is an arithmetic number, because the mean of its divisors is an integer number (10075099).

Almost surely, 2^20150197 is an apocalyptic number.

It is an amenable number.

20150197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20150197 is an equidigital number, since it uses as much as digits as its factorization.

20150197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 20150197 is about 4488.8970805756. The cubic root of 20150197 is about 272.1195633887.

Adding to 20150197 its reverse (79105102), we get a palindrome (99255299).

The spelling of 20150197 in words is "twenty million, one hundred fifty thousand, one hundred ninety-seven".