20652157 has 2 divisors, whose sum is σ = 20652158. Its totient is φ = 20652156.

The previous prime is 20652133. The next prime is 20652187. The reversal of 20652157 is 75125602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13111641 + 7540516 = 3621^2 + 2746^2 .

It is a cyclic number.

It is not a de Polignac number, because 20652157 - 2¹⁹ = 20127869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20652187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10326078 + 10326079.

It is an arithmetic number, because the mean of its divisors is an integer number (10326079).

Almost surely, 2^20652157 is an apocalyptic number.

It is an amenable number.

20652157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20652157 is an equidigital number, since it uses as much as digits as its factorization.

20652157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 20652157 is about 4544.4644348922. The cubic root of 20652157 is about 274.3606391890.

Adding to 20652157 its reverse (75125602), we get a palindrome (95777759).

The spelling of 20652157 in words is "twenty million, six hundred fifty-two thousand, one hundred fifty-seven".