20626121 has 2 divisors, whose sum is σ = 20626122. Its totient is φ = 20626120.

The previous prime is 20626093. The next prime is 20626127. The reversal of 20626121 is 12162602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11560000 + 9066121 = 3400^2 + 3011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20626121 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20626093 and 20626102.

It is not a weakly prime, because it can be changed into another prime (20626127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10313060 + 10313061.

It is an arithmetic number, because the mean of its divisors is an integer number (10313061).

Almost surely, 2^20626121 is an apocalyptic number.

It is an amenable number.

20626121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20626121 is an equidigital number, since it uses as much as digits as its factorization.

20626121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20626121 is about 4541.5989475074. The cubic root of 20626121 is about 274.2452959907.

Adding to 20626121 its reverse (12162602), we get a palindrome (32788723).

The spelling of 20626121 in words is "twenty million, six hundred twenty-six thousand, one hundred twenty-one".