20902241 has 2 divisors, whose sum is σ = 20902242. Its totient is φ = 20902240.

The previous prime is 20902237. The next prime is 20902279. The reversal of 20902241 is 14220902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20286016 + 616225 = 4504^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 20902241 - 2² = 20902237 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20901241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10451120 + 10451121.

It is an arithmetic number, because the mean of its divisors is an integer number (10451121).

Almost surely, 2^20902241 is an apocalyptic number.

It is an amenable number.

20902241 is a deficient number, since it is larger than the sum of its proper divisors (1).

20902241 is an equidigital number, since it uses as much as digits as its factorization.

20902241 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 20902241 is about 4571.8968711028. The cubic root of 20902241 is about 275.4636410176.

The spelling of 20902241 in words is "twenty million, nine hundred two thousand, two hundred forty-one".