20107621 has 2 divisors, whose sum is σ = 20107622. Its totient is φ = 20107620.

The previous prime is 20107603. The next prime is 20107639. The reversal of 20107621 is 12670102.

It is a balanced prime because it is at equal distance from previous prime (20107603) and next prime (20107639).

It can be written as a sum of positive squares in only one way, i.e., 19936225 + 171396 = 4465^2 + 414^2 .

It is a cyclic number.

It is not a de Polignac number, because 20107621 - 2¹¹ = 20105573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20107691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10053810 + 10053811.

It is an arithmetic number, because the mean of its divisors is an integer number (10053811).

Almost surely, 2^20107621 is an apocalyptic number.

It is an amenable number.

20107621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20107621 is an equidigital number, since it uses as much as digits as its factorization.

20107621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 20107621 is about 4484.1522052669. The cubic root of 20107621 is about 271.9277715152.

Adding to 20107621 its reverse (12670102), we get a palindrome (32777723).

The spelling of 20107621 in words is "twenty million, one hundred seven thousand, six hundred twenty-one".