20726899 has 2 divisors, whose sum is σ = 20726900. Its totient is φ = 20726898.

The previous prime is 20726897. The next prime is 20726921. The reversal of 20726899 is 99862702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20726899 - 2¹ = 20726897 is a prime.

Together with 20726897, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20726897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10363449 + 10363450.

It is an arithmetic number, because the mean of its divisors is an integer number (10363450).

Almost surely, 2^20726899 is an apocalyptic number.

20726899 is a deficient number, since it is larger than the sum of its proper divisors (1).

20726899 is an equidigital number, since it uses as much as digits as its factorization.

20726899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 20726899 is about 4552.6804192695. The cubic root of 20726899 is about 274.6912192589.

The spelling of 20726899 in words is "twenty million, seven hundred twenty-six thousand, eight hundred ninety-nine".