20662637 has 2 divisors, whose sum is σ = 20662638. Its totient is φ = 20662636.

The previous prime is 20662619. The next prime is 20662643. The reversal of 20662637 is 73626602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12013156 + 8649481 = 3466^2 + 2941^2 .

It is a cyclic number.

It is not a de Polignac number, because 20662637 - 2⁸ = 20662381 is a prime.

It is a super-3 number, since 3×20662637³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is a zygodrome in base 8.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20632637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10331318 + 10331319.

It is an arithmetic number, because the mean of its divisors is an integer number (10331319).

Almost surely, 2^20662637 is an apocalyptic number.

It is an amenable number.

20662637 is a deficient number, since it is larger than the sum of its proper divisors (1).

20662637 is an equidigital number, since it uses as much as digits as its factorization.

20662637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 20662637 is about 4545.6173398121. The cubic root of 20662637 is about 274.4070397220.

The spelling of 20662637 in words is "twenty million, six hundred sixty-two thousand, six hundred thirty-seven".