20632861 has 2 divisors, whose sum is σ = 20632862. Its totient is φ = 20632860.

The previous prime is 20632853. The next prime is 20632877. The reversal of 20632861 is 16823602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10929636 + 9703225 = 3306^2 + 3115^2 .

It is a cyclic number.

It is not a de Polignac number, because 20632861 - 2³ = 20632853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20632811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10316430 + 10316431.

It is an arithmetic number, because the mean of its divisors is an integer number (10316431).

Almost surely, 2^20632861 is an apocalyptic number.

It is an amenable number.

20632861 is a deficient number, since it is larger than the sum of its proper divisors (1).

20632861 is an equidigital number, since it uses as much as digits as its factorization.

20632861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20632861 is about 4542.3409163118. The cubic root of 20632861 is about 274.2751644602.

The spelling of 20632861 in words is "twenty million, six hundred thirty-two thousand, eight hundred sixty-one".