20129651 has 2 divisors, whose sum is σ = 20129652. Its totient is φ = 20129650.

The previous prime is 20129639. The next prime is 20129653. The reversal of 20129651 is 15692102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20129651 - 2⁶ = 20129587 is a prime.

Together with 20129653, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20129651.

It is not a weakly prime, because it can be changed into another prime (20129653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10064825 + 10064826.

It is an arithmetic number, because the mean of its divisors is an integer number (10064826).

Almost surely, 2^20129651 is an apocalyptic number.

20129651 is a deficient number, since it is larger than the sum of its proper divisors (1).

20129651 is an equidigital number, since it uses as much as digits as its factorization.

20129651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 20129651 is about 4486.6079614782. The cubic root of 20129651 is about 272.0270436995.

The spelling of 20129651 in words is "twenty million, one hundred twenty-nine thousand, six hundred fifty-one".