20838929 has 2 divisors, whose sum is σ = 20838930. Its totient is φ = 20838928.

The previous prime is 20838919. The next prime is 20838931. The reversal of 20838929 is 92983802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14326225 + 6512704 = 3785^2 + 2552^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20838929 is a prime.

Together with 20838931, 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 (20838919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10419464 + 10419465.

It is an arithmetic number, because the mean of its divisors is an integer number (10419465).

Almost surely, 2^20838929 is an apocalyptic number.

It is an amenable number.

20838929 is a deficient number, since it is larger than the sum of its proper divisors (1).

20838929 is an equidigital number, since it uses as much as digits as its factorization.

20838929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 20838929 is about 4564.9675792934. The cubic root of 20838929 is about 275.1852371816.

The spelling of 20838929 in words is "twenty million, eight hundred thirty-eight thousand, nine hundred twenty-nine".