20632691 has 2 divisors, whose sum is σ = 20632692. Its totient is φ = 20632690.

The previous prime is 20632663. The next prime is 20632693. The reversal of 20632691 is 19623602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20632691 is a prime.

Together with 20632693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20632693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10316345 + 10316346.

It is an arithmetic number, because the mean of its divisors is an integer number (10316346).

Almost surely, 2^20632691 is an apocalyptic number.

20632691 is a deficient number, since it is larger than the sum of its proper divisors (1).

20632691 is an equidigital number, since it uses as much as digits as its factorization.

20632691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 20632691 is about 4542.3222034550. The cubic root of 20632691 is about 274.2744111811.

The spelling of 20632691 in words is "twenty million, six hundred thirty-two thousand, six hundred ninety-one".