20690927 has 2 divisors, whose sum is σ = 20690928. Its totient is φ = 20690926.

The previous prime is 20690903. The next prime is 20690939. The reversal of 20690927 is 72909602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20690927 - 2¹⁴ = 20674543 is a prime.

It is a super-2 number, since 2×20690927² = 856228920238658, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20690977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10345463 + 10345464.

It is an arithmetic number, because the mean of its divisors is an integer number (10345464).

Almost surely, 2^20690927 is an apocalyptic number.

20690927 is a deficient number, since it is larger than the sum of its proper divisors (1).

20690927 is an equidigital number, since it uses as much as digits as its factorization.

20690927 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 20690927 is about 4548.7280639757. The cubic root of 20690927 is about 274.5322163066.

The spelling of 20690927 in words is "twenty million, six hundred ninety thousand, nine hundred twenty-seven".