20629691 has 2 divisors, whose sum is σ = 20629692. Its totient is φ = 20629690.

The previous prime is 20629657. The next prime is 20629699. The reversal of 20629691 is 19692602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20629691 - 2²² = 16435387 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20629699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10314845 + 10314846.

It is an arithmetic number, because the mean of its divisors is an integer number (10314846).

Almost surely, 2^20629691 is an apocalyptic number.

20629691 is a deficient number, since it is larger than the sum of its proper divisors (1).

20629691 is an equidigital number, since it uses as much as digits as its factorization.

20629691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 20629691 is about 4541.9919638854. The cubic root of 20629691 is about 274.2611173405.

The spelling of 20629691 in words is "twenty million, six hundred twenty-nine thousand, six hundred ninety-one".