20422637 has 2 divisors, whose sum is σ = 20422638. Its totient is φ = 20422636.

The previous prime is 20422613. The next prime is 20422651. The reversal of 20422637 is 73622402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19945156 + 477481 = 4466^2 + 691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20422637 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20422657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211318 + 10211319.

It is an arithmetic number, because the mean of its divisors is an integer number (10211319).

Almost surely, 2^20422637 is an apocalyptic number.

It is an amenable number.

20422637 is a deficient number, since it is larger than the sum of its proper divisors (1).

20422637 is an equidigital number, since it uses as much as digits as its factorization.

20422637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 20422637 is about 4519.1411794720. The cubic root of 20422637 is about 273.3404715896.

The spelling of 20422637 in words is "twenty million, four hundred twenty-two thousand, six hundred thirty-seven".