20072621 has 2 divisors, whose sum is σ = 20072622. Its totient is φ = 20072620.

The previous prime is 20072617. The next prime is 20072627. The reversal of 20072621 is 12627002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15721225 + 4351396 = 3965^2 + 2086^2 .

It is a cyclic number.

It is not a de Polignac number, because 20072621 - 2² = 20072617 is a prime.

It is a super-2 number, since 2×20072621² = 805820227619282, which contains 22 as substring.

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 = 20072593 and 20072602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20072627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10036310 + 10036311.

It is an arithmetic number, because the mean of its divisors is an integer number (10036311).

Almost surely, 2^20072621 is an apocalyptic number.

It is an amenable number.

20072621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20072621 is an equidigital number, since it uses as much as digits as its factorization.

20072621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 20072621 is about 4480.2478726071. The cubic root of 20072621 is about 271.7699043481.

Adding to 20072621 its reverse (12627002), we get a palindrome (32699623).

The spelling of 20072621 in words is "twenty million, seventy-two thousand, six hundred twenty-one".